And to the argument of "people would download silly mods that would be cheating and all that it implies", well, it's YOUR responsibility what mods you download. want to cheat? your problem. It's like online play. They have a big, long warning in every game that the game experience might change while going online. All you'd have to do is add a disclaimer, and you're free to go
Also, that wouldn't mean mods would have to go down in quality either. graphics mods won'tb a able to run on consoles anyways, so make them only for PC. And when another mod messes with the performance too much, make a light version or something. You know, just because consoles would be able to use them, doesn't mean people will do mods only for them