Does that even make business sense? No it doesn't. For one, Extreme Rules will never sell like WM no matter what happens, and they'd make the same damn profit with Bryan going in as champion in his hometown that Bryan chasing the championship in his hometown, because it's still F'n Bryan either way. So why sacrifice WM for Extreme Rules? In what way does that make sense? WMXXX is already going to take a big fallback from 27, 28 and 29 because of Rock's absence, Batista's lack of drawing ability as a headliner, frustration with Bryan and now CM Punk's absence. I've already long since decided I'm streaming that shit if I don't have the Network by then, and I guarantee many others are thinking the same. Hell, if it wasn't for the network this WM is already on the way to selling less than the last 5 years, maybe. As for your other points:
-Bryan could probably could beat Batista, who knows? But we know damn well if it wasn't for the crowd shitting all over the Royal Rumble, Batista would close the show like its all good.
-There is no speculation about HHH; there's already so much notorious sh*t said about him/Kliq in shoots and whatnot. Simple deduction skills bring me to that conjecture: He audible'd the WM 19 main event for some BS with his buddy Nash, it's well known he's been involved with the Kliq's crap, He had no reason to go over at Wm16 as I already mentioned, He almost single handedly ruined the Summer of Punk, Bret already confirmed he and HBK tried hard to get Rock below him, Cornette talks about his shit seemingly on the daily, so on and so forth. The NXT thing does nothing for your argument: they are not fighting HHH; him bringing in indie guys means nothing in a burial argument. But like I said, this is only a theory, and it's very plausible.
-Really? WWE pushes whoever's over and making money? Which is why Zack Ryder went from being a top seller and over US champ to barely making it on a dark match 2 years later? Is that also why Alberto Del Rio, who led the crowd to a chorus of crickets for 2 years running, dominated the WHC scene? Did Ryback, the biggest breakout of 2012, get buried because he wasn't over enough? And is that why Kofi, who is consistently over regardless, can't even get a decent feud since Orton called foul? WWE still loves big guys too, don't fool yourself. Great Khali was world champion. Big Show just stunk up a Survivor Series main event. Roman Reigns, conveniently the biggest guy in the Shield, is getting the big push. Erick Rowan is getting primetime booking based solely off his size and look regardless of the fact that Bray and Harper make him look irrelevant on a weekly basis with their progression. So knowing all this, say that again.
-WWE has made some of the best and worst decisions I've ever seen in booking wrestling. For every Deadly Games, there's like 3 Katie Vicks. It's damn possible for Sheamus/Bryan to happen.