IMO, a mass recitation like this is much more likely to deflate the crowd than to fire it up. They'll recover quickly, of course, but this is just one of those things that may sound like a good idea but probably isn't.
The 7 maxims are no less valid today than they were in Neyland's time, but inspirational they're not.
It HAS been done before...it was an epic fail. It is far, far too long. 100,000+ people putting different inflections on different words within a sentence comes off sounding like 100,000+ people with the mumbles.