Wyatt/Orton would be a good WWE title match for WM. Orton could use another title feud (it's been a long time, and years since he held the belt, and he's good) and it's time for Wyatt to start moving up into that area.
AJ's had the belt for 4+ months. That's a respectable run, he doesn't need to hold it forever. Yeah I'd probably rather see him defend it at Wrestlemania against somebody - preferrably not Cena though (just because it would be repetitive), but if that's not on the horizon oh well.
The only regrettable thing about AJ's run is that too much of it has been taken up by the Ellsworth stuff. It was fine at the time but in retrospect his only two opponents will have been John Cena and Ambrose. It would be good if he gets a chance to feud with the likes of Orton or Wyatt befo-oh wait, he's supposed to be a heel. I actually forgot that.