Since the XFL folded I feel like the UFL had the best chance of any of them to succeed and it failed. We already have Arena league (and may minor league versions of it as well) to fill that gap with NFL and NCAA wash outs.
Don't get me wrong, I'll still watch it, but I have very limited expectations.
My town's 3,000 seat civic center occasionally hosts indoor football on the lowest level and gets tepid support.
All depends what market's he hits, how big of a league, and a few other variables. There's no shortage of players, but yeah...