The Gongshow
Fire JBB
It's weird because Corbin/Ambrose is also lining up to be a match like that. I don't know if they're going for two gimmick matches like that, or maybe one of them turns into a Ladder or TLC match, either for the IC Title or for a Smackdown contract (Styles/McMahon).
Corbin/Ambrose could also be a Last Man Standing match.
I'd be fine with two "hardcore" style matches. It will be interesting to see which feud gets what match type. I feel like both need them. Ambrose/Corbin for storytelling purposes and AJ/Shane so that Shane can just be a spot monkey since he can't compete with Styles in an actual wrestling match.
10-12 minutes of Shane trying to wrestle with AJ would be dumb. It should be a brawl so AJ can wrestle and then they both do a couple spots.
I know that Styles deserves better than Shane at 'mania, especially after inexplicably losing to Jericho last year, but at least its a high profile match and will probably be wildly entertaining.
This. It could be worse I guess.