It's worth distinguishing ITER from fusion research as a whole. While it's an interesting project, I doubt it's going to be first to market for actual power generation. Its design is fighting some pretty nasty scaling laws that newer research is bypassing.

I wouldn't advocate shutting down fission plants with the expectation that they'd be replaced by fusion in the immediate future, obviously, but some of the non-ITER work might end up viable sooner than a lot of people expect.