First off, why are people putting the Rock and Austin and Goldberg? How old are you, 10?
U.S Title/I.C Title Extreme Rules: Daniel Bryan (c) vs. John Morrison vs. Evan Bourne vs. Dolph Ziggler (c) vs. Kofi Kingston vs. Christian
With MITB now getting it's own PPV, this match can used as the big multi-man spot-fest to get the crowd pumped. TNA had a gimmick match that was very similar to this at Bound For Glory, the Monster's Ball. This is a two fall match, with each fall for a belt. Mainly there to get the crowd pumping at the beginning of the PPV and satisfy everyone looking for big spots off high things through tables. Can also be used to switch belts between shows and unify the titles with one man winning both falls.
WWE Tag Team Championships Tag Team Turmoil: The Hart Dynasty (c) vs. The Usos vs. The Dudebusters vs. The Gatecrashers vs. Santino & Koslov vs. Drew McIntyre & Cody Rhodes vs. Darren Young & Percy Watson
Now with one singular tag team title, it's perfectly acceptable for such a thing to happen. WWE have the talent to make a successful division, a match like this would put the limelight on it.
Chris Jericho vs. C.M. Punk
It looks like Y2J is coming back as a face, so this match-up would be perfect. A good set-up would be Y2J returning at the Royal Rumble and eliminating Punk, which would in turn make Punk set out on a crusade against Jericho, stating that Y2J used to call the masses parasites and hypocrites, and he now has become one himself. These two men are the best mic workers of the last few years, so I have no doubt the buildup would be great, and is there any need to doubt the possible in-ring chemistry between these two?
10-Man Tag Team: Nexus (Wade Barrett, Justin Gabriel, Michael Tarver, Heath Slater & David Otunga) vs. Genesis (Kaval, Michael McGillicutty, Husky Harris, Eli Cottonwood & Lucky Cannon)
A match like this you'd have to be careful with in order to ensure you don't stink the joint out, but if it was to be exactly what it's designed to be, fast paced gang warfare. I'd have Kaval eliminate Barrett from the Rumble in shocking fashion, only to have Nexus retaliate by invading Smackdown and crippling Kaval. Then, during the Elimination Chamber, have Kaval return by running through the crowd, climbing the Chamber and busting through the roof, and ideally hitting a big Ghetto Stomp on Barrett from one of the pods causing him to be eliminated. Then, as Nexus are furious outside the structure, have Genesis make their debut by assaulting them also. From there, it goes to a "Which NXT season had more talent?" squabble.
John Cena vs. Triple H
With HHH likely to be revealed as the mystery GM and the puppeteer of Nexus, he'll be likely Hunter will be the monster heel authority over the next few months. I'd have him abusing his power with Cena by authorizing multiple Nexus beatdowns, degrading him constantly and keeping him away from the WWE championship, finally the board of directors would step in and announce a showdown with Cena at Mania with HHH's GM responibilities on the line. This is the kind of match that you can really only have at a Mania.
Big Show vs. Alberto Del Rio
Quick men's filler match with Big Show getting sick of Del Rio's bullying tactics and tells ADR to try it on him. I'd personally book it with a segment with Alberto hitting Show with his Bentley backstage to give ADR a bit of an edge going in.
Sheamus vs. The Undertaker
I for one don't see Taker retiring at this upcoming Mania, it's beyond me that someone could come so far and not go for the big 20th match. I'd have Sheamus go after the streak, to which Undertaker is generally unresponsive. This angers Sheamus, to the point that he attacks Paul Bearer and disposes of the urn, weakening the Phenom. Have it then revolve about Taker accepting and Sheamus constantly making Taker crumble, making everyone wonder if Taker can pull one more out the bag.
World Heavyweight Championship Triple Threat: Kane (c) vs. Edge vs. Rey Mysterio
I wouldn't really put this match up to much, with SmackDown's main event group looking as slim as it is. (Hell, I had to put in a current Raw star to get a decent match.) I would fully expect Edge to have been chased off to SmackDown by this stage by the GM and gone back to being a face, as I just don't see him as a useful heel these days. I'd have Kane regain the WHC at Elimination Chamber, and then have some of typical Smackdown Beat The Clock stuff-up with both Edge and Mysterio getting the same time. Really just a quick one to get Edge his 10th World title win.
United Divas Championships Handicap: Laycool (c) vs. Beth Phoenix
I don't see any kind of one-on-one diva match that would be worthy of getting a Mania spot and I'm sick of seeing a 8-diva/lumberjill match, so make things interesting and have both Layla and Michelle try to fend off the strength of Phoenix.
WWE Championship: Randy Orton (c) vs The Miz w/Alex Riley
With The Miz on the roll he's been on, it would make sense to have him make his full-blown transformation into main-event star. I would make things interesting by having Miz cash in his MITB and lose, forcing him to make himself another path to the promised land, that being the Royal Rumble. I would have Randy hold the belt all the way from NoC to WM to really give him an established run, and would really give Miz the rub when he wins the strap. Having this match last would really set the tone for the following year and say "This guy is the next big thing." Miz can hold himself with the promos, though Randy would need to be watched carefully to ensure he isn't going through the motions like he tends to do sometimes. The in-ring aspect would worry me as well, but the fact is these two are the fastest rising face and heel in the company, so they need to deliver the goods.
And scene. That's how you do a fantasy PPV card, n00bs.