Dre is at a level now where he cannot fall off. Lemme put it to ya like this. if Ray Charles were still alive and released an album in June, and it was really bad, people would say it was really bad and wouldn't listen to it, but in no way would that hurt him as an artist or his legend because he was at a level where he couldn't be hurt, period.
Dre is at that same level. No matter what he does, whether it ends up another bonafide hit/classic or is considered a disappointment, he's still going to be the Godfather of rap and the most respected producer in the game.