Something stands out about the championship match of WrestleMania XV
After taking a look through some old notes, I think I noticed that the only time that a "heel" won the major championship of the WWE from a "face" at any WrestlaMania is at the 1999 WrestleMania, when Steve Austin won it from The Rock.   In any version of the major championship {WWE Championship, World Heavyweight Championship), the only time I remember seeing the "heel" leave the major championship match of WrestleMania as the champion is only when he entered the match as the defending champion (such as Chris Jericho successfully defending against Edge in 2010, and the Miz successfully defending against John Cena in 2011). Otherwise, the "face" typically wins the major championship match, especially when the face is the defending champion.
This may just be speculation, but probably the reason that Steve Austin as the "heel" got to win the WWE Championship at WrestleMania 15 is because it was held in his home state of Texas. ..
.. So, this major championship match of WrestleMania 30 should be quite interesting in the way it unfolds, as there are two possibilities; if in the Bryan/HHH match, Triple H were to win, the triple threat major championship match would have all three participants as "heels", including the champion Randy Orton, making it so that no matter who wins, the champion would be heel regardless of who the champion is, barring a "face turn". On the other hand, if in the Bryan/HHH match, Daniel Bryan were to win, the triple threat major championship match would have two heels including the champion Randy Orton, and one face, obviously being Daniel Bryan - and if that's the case, with the history being the way it is with this sort of thing, they would almost assuredly mean they would have to have Daniel Bryan win the big championship match, as WrestleMania history usually dictates. Although, we never know how they might possible go against their own history. Plus, there's no telling whether they will even have Daniel Bryan defeat Triple H to get into the triple threat match at all. 
 
But they could surprise everyone and have the championship match end up being a fatal-four-way match, in which case anything could happen. But I think the majority of us might agree that the one least likely to come out of the championship match with the championship is Batista; he's the only one of the four guys to disappear before long, since he hasn't been there. But also, being that Randy Orton is the "heel" and that he's had the championship since October, he too isn't likely to be the champion after that match. So, if we were putting odds on it, all historical facts considered, the two most likely to have the championship after that match (be it a triple threat or fatal four way, if that were to happen) is either Daniel Bryan or Triple H - Daniel Bryan because he can be the hero of WrestleMania as the good guy, or Triple H because he hasn't had the championship in five years and because he's the boss.
But as I say, to my recollection, only in 1999 did a heel win the major championship at WrestleMania.