The World League and NFL Europe did not (to my recollection) have teams directly tied to NFL teams. The primary benefit would be to NFL teams, being able to take their time developing "project" type players and being able to retain the rights to more players. I really don't think costs would be all that high if players were mostly paid about on the level of practice squad players, and if marketed right, it might even be a net money maker. Injuries shouldn't be that much worse than with practice squad members now. I'd eliminate the practice squad and have the D team practice with the big team - keeping the franchises geographically close - Waukesha Packers, Peoria Bears, Fargo Vikings, Flint Lions, etc.

I'd hate to see this replace the 3 year NCAA thing, as that would do major harm to college football IMO.