well I recently watched the new wrestlemania dvd.. "the true story of wrestlemania". you can watch it all on youtube if you haven't already seen it, and from what I can gather from that, Vince basically wanted to create an original, once in a lifetime experience for the viewer. it was all essentially showing off, and trying to make it a big deal, and he thought with this idea it would get people interested and he also wanted to prove that he could pull it off, practicality wise. A lot of people weren't that keen on it and I think that's why nothing like that has been done since... One of the major flaws I think is that the people in each arena had to watch 2 hours of the show on big screens, and only an hour of live action. no one wants to pay for that.