One good rebuttal below:
I keep trying to see what the down side is. I guess it'll be along these lines: team sees they aren't good, throws in the towel, trades away most/all decent players, product declines, home team fans stop attending the games, stands are empty, it's a bad look for the NFL.
I mean, it seems exciting if you are on the receiving end of the big trade, but what if you were a fan of DEN, PIT, DET, etc and your favorite player just got traded away and it's clear your team is going to suck for the rest of the season? Would you even bother going to the games? Isn't the most likely outcome "the rich get richer" as they cherry pick talent from the weaker teams and use clever cap tactics to keep their talent level high, while the weak teams see declining revenues and interest levels so can't attract talent?
I guess the old NFL would worry about this stuff, the new one not so much.