Great post. The tier system was fantastic. Experimenting with different lineups added a ton of replayability on its own. If that game had a franchise similar to what you have suggested.. oh man. I might still be playing it today.
I've often wondered where 2K football would be at this point if they never stepped away from the sport. It's hard to look at what NBA 2K has evolved into and not think like that sometimes. I think Madden getting an exclusive license was one of the worst things to ever happen in the landscape of sports gaming. We could've had something special and were robbed of any possibility of it happening.