Sadly, I think the hardcore wrestling fanbase here has died down in the last decade. In the late 00s-early 10s there was a mix of fans that grew up with 97-2002 WWF/E (myself included) and the younger audience that was picking up from 2007 when wrestling was once again on national TV.
Once Fox Sports got the rights I feel things died down considerably.
On the other hand though, I've seen every musical act you can imagine run big stadiums or multiple arena dates to sold out crowds with embarrassingly high ticket prices so WWE running a big show might get some numbers anyway, lol.