Unfortunately I feel like these spring leagues don't "get" one of the biggest (bigger?) reasons the XFL tanked...poor quality of football. If you're going to go big, you'd better PLAY big too.
If you're going to call yourself a minor league, do so, because it sets an expectation in the viewing audience's mind that, yes...these players have a way to go. They are developing into pros. However, touting yourself as a Spring League "full of guys that didn't make the cut in the NFL or CFL" is noble...but again, there's a reason these guys didn't make it. You're essentially watching NFL practice squad rejects cosplay as pros (sorry for being harsh) on network TV...which after watching the XFL is not pretty. The AAF might have grand ideas of being a league of Kurt Warners, but they ought to be careful because more times than not the leagues end up being full of John Averys (who? Exactly...he was the leading rusher in the XFL in its final season).
Listen, I'm all for giving guys a chance to develop...but I don't think this league nor the XFL is the way to do it. I like the rule changes and experiments...but The NFL needs to have a vested interest in the league like they did in NFL Europa. I think the dying years of NFL Europa got it correct in that players were put in that league by teams to get better (I thought it was great how they had the patch of the NFL team that owned their contract rights on their...sleeve?). When you were watching, you knew that Kurt Warner, tho taking snaps for the Amsterdam Admirals, had NFL interest and had a possible pipeline to get there. There were walk-ons, sure, but at least scouts were looking at them.
TL;DR - Bring the NFL Europa concept home and call it NFL 2 or The Minor League of American Football or NextFL.