Tom that's true, but at the time, having the whole cast together get the chance to make ST VI wasn't even a given, because of how badly ST V did. Not too dissimilar a situation that TNG found itself in after Nemesis. The only difference is that Paramount really wanted to do something with TOS for the 25th Anniversary, as opposed to Paramount changing Presidents and wanting to end the 20 year run of TNG/DS9/VOY/ENT era Trek asap!