To be clear, I wasn't talking about conversations. Heck, we're having fun dissecting fifty-year-old episodes every day. I was talking about the actual movies and series having to establish "officially" what's still in the continuity, as though there's an office somewhere, complete with a notary public, that can revoke a movie's status as canon. When it comes to making the future movies, you don't need to rule that, say, THE FINAL FRONTIER isn't "canon" anymore. You just never mention Sybok again if there's no need to. Doesn't mean he's been stricken from the continuity. Just means that nobody is in a hurry to bring him back anytime soon--or put him on the cover of a novel! Or, to cite another example, even if the Prime Universe comes back, don't expect to ever see a sequel to "Spock's Brain" or "The Way to Eden." They may have happened, but they're not likely to inspire any future stories.