So I can't see how extending an existence qualifies as evicting an existence. That's a contradiction.
How so? If somebody wins, somebody else loses, especially in the zero-sum game of finite resources in the TOS movies.
By allowing the Grissom
to hog more of Starfleet history, you're narrowing down the niche for other ships, types and stories. Which is the exact opposite of what ST3 model work was all about! With three prominent ships, two of these all-new, the movie made Starfleet more diverse than ever - and now we're supposed to believe that the Grissom
doesn't represent diversity after all, and that "Federation Survey Vessel" is just a fancy name for a retired starship?
Vast effort was put into creating something the audience wouldn't mistake for another generic starship. Apparently, it was wasted effort...
I think you are reading too much into this.
Isn't that a hoot...