As far as rules....
If they can define a catch clearly, they will have a step up on the NFL.
Nobody in the NFL seems to know what a catch is. I know all of the possession, football move, etc. Even though I understand what a catch should look like, I see way too much variability in what is called, upheld, and/or reversed. I've even seen the rules analyst (Peirera?) explain why something was a catch in one game, same scenario occurs a different game, and he'll explain why it wasn't a catch. He seems to be a mouthpiece to support the call on the field unless it was obvious that the ref was wrong.
As well a more consistent application of the rules for the "cheap" hits. There is a ton of variabilty on how/where tackling, blocking is legal. What is cheap, and what isn't in the NFL varies by ref, team, player, quarter, and time on the clock.
By the way, I heard Lebatard discussing Jeff Brohm's famous quote. If you aren't already heard.
I remember watching a few games, way back when and thinking some of the rules were hokey, but the games were entertaining.
Maybe Lexington or Louisville would be a franchise. Close to an NFL market with disgruntled fans, and new market for pro football. They could play in either stadium in the spring summer without any problems, since they are already football only fields.