LOL! I know about the Premier League and the lesser ones, but it doesn't really translate well into American football because arena football is a joke and the NCAA would have "issues" with USC and Texas going pro while the Texans and Saints came down to their deserved level.
Well, start a B league, give San Antonio, Los Angeles, Portland, Salt Lake City, Columbus, Las Vegas, and Austin teams, drop two crappy NFL teams into it. Different pay scale, different TV package money, etc. Modify it enough so that the top team moves up to the NFL, bottom NFL team moves down (and has to do a coin flip for #1 draft pick)