System of a Down is on hiatus...they ended with Hypnotize/Mezmerize, which I think were great albums. I wouldn't be able to judge whether or not they are on the fall until they start making more music.
I completely agree with Incubus. They have been getting progressively worse with each album.
Korn isn't on the fall, they have fallen. I don't think you can get much worse or irrelevant than they are right now. Unless you are Fred Durst. Korn hasn't done anything that made waves since Untouchables...maybe.
YES, I ADMIT IT, I LISTEN TO A LOT OF MAINSTREAM, BUT ITS NOT ALL SH*T, ONLY JUSTIN BIEBER AND ALL THOSE OTHER SUCKASS TEENY BOPPERS MAKE TERRIBLE MUSIC!!!
And you don't like Hypnotize/Mezmerize at all? It's understandable that you would rank them last (in all honesty, so do I), but that doesn't necessarily mean they are bad.