Undertaker VS Lesnar is the only match that'll survive a brutal onslaught of heckling and boos, if Bryan loses to Triple H. Everything else? Yeah, the crowd will take a massive diarrhea dump (especially Orton VS Batista) on the rest of card with no restraints, and it's not even close.
I'm guessing they'll go with this match early on in the 8:00 window. You give the crowd a chance to rest for a while, so they'll have enough energy for another massive explosion, when Bryan wins the title. On top of that, Bryan will have more time to recharge his batteries for the main event.
Bryan defeats Triple H with the running knee (Triple H already tapped once at Mania. It's not happening again) to move on to a triple threat match, but it's not going to be that easy. I can easily see a furious and embarrassed Triple H taking out his frustrations on Bryan with a brutal post-match attack.
Bryan goes into the main event to overcome the odds to beat Orton and Batista as a wounded fighter, and we'll see one hell of a spectacle with Bryan holding up the WWE and WHC, and the entire crowd chanting "YES!"
WWE NEEDS to pull the trigger on Bryan at Wrestlemania with no shenanigans (Summerslam, Battleground, Night Of Champions, etc.). I get the whole point of the scrappy underdog chasing the brass ring, but at some point, you need to deliver a real pay off to keep the fans from losing interest. Wrestlemania is the perfect stage, and the timing is right.
Also, it wouldn't surprise me if Evolution returned for another run. I find it hard to (or damn near impossible) believe it's all one big coincidence with Bryan fighting off Triple H, Batista, AND Randy Orton to get to the WWE WHC. They're all heels now, so an Evolution return is not an unrealistic possibility.
All three men have a common enemy now, and without the WWE WHC, Orton can join forces with Batista to make Bryan's life a living hell. If I'm using recent events as a continuing pattern, something big (i.e. Lesnar's return) happens on the Raw after Wrestlemania. So when you consider the series of recent events, we could see the image of a reunited Evolution standing together over a beaten WWE WHC Daniel Bryan with Line In The Sand playing in the background on the post Wrestlemania XXX Raw.