Kiss has made waves with saying that it will continue without Simmons and Stanley, but I think that undersells what Kiss is. Kiss is basically "Paul Stanley's Vision" in the sense that he's driven the decision-making in the band for decades now and I think it can continue as a revue, but the creative force, the innovation will die with Paul.
I saw something about that, too. I don't remember now who they quoted, but as with many things I see attributed to Paul, and most things I see attributed to Gene, I took it with a grain or two of salt. Once the original quartet broke up, it became clear (to me and my cadre anyway) that Gene and Paul were the core of the band. You know a lot more about KISS that I do, though, so if it's really just Paul and not so much Gene, I believe you. But the idea of KISS continuing without them is pretty silly IMO.
We all know that DT survived without Mike, but I don't know if that would be the case if it was Mike AND JOHN that decided to pursue other artistic endeavors.
Similarly, I wouldn't consider it DT without JP. They've changed singers, keyboard players, and drummers now. JM is great, but if he were replaced it would still sound like DT. I think if MP and JP for some reason left at the same time, Dream Theater wouldn't continue anyway, so it's probably a moot point. I just don't see JLB, Jordan, and JM checking in with each other and choosing to try to keep DT alive. It seems far more likely that they'd agree that they had a good run, but they each have other things they can and would like to do.