good idea, bad timing
It could work if attributes were all fully functional. But right now most Kickers/Punters are stronger than most DEs.
Auto progression would have to be adjusted to a system that tracked what position the player actually played somehow i.e. a player on the o-line would get more strength per level than speed.
A lot of work, a lot of complications, and 99.99999999% never will happen.
Make your own sim league

the idea does have potential, just not here.