There's no way they would do a Wrestlemania on tape delay, at least not without trying it for a regular PPV first. UFC did it but I think they ended up just showing it for free on TV. If WWE does it they'd have to sell it cheaper for sure, or air it live earlier in the day. Which wouldn't be a big deal IMO, seeing as it's Sunday, so long as it's not Football season.
I want it back in Canada though. Toronto has a huge football arena, we have the olympic stadium here in Montreal that could hold 65K+, and we always have great crowds too.