New 52 Superman and Lois were the main Superman and Lois. Until they weren't.
When I say on-again/off-again, I don't just mean in Slott's run (although RYV did begin under Slott's metaphorical pen where they were most definitely on-again). I meant the franchise in general. If you want to argue that the cycle shouldn't have to repeat over and over again, I would actually agree that things should be rethought. But I don't think they will be. That's the thing about mainstream super hero comics. "What's old is new again."