TOS was too close to the previous decade NOT to look dated in 79. That the ship interiors looks (to me and to others) less dated than TMP may reflect on it being overall a better design, and seemingly so alien now that it DOES look futuristic. At the same time, the TMP Enterprise is still gorgeous. It takes everything good about the TOS Enteprise and bumps it up a bit.
Even if they'd been available, using TOS models and interior sets in 79 on the big screen would have looked absurd. 2001: A Space Odyssey, Star Wars, and (sometimes overlooked now) Close Encounters, had simply changed too much what a film audience expected by then from space ships.
You can see a contemporary film, The Black Hole, where they did refuse to follow entirely in ILM's footsteps. Disney went in-house as always for effects and sets and the result is, well now it would be called retro perhaps, but if you compare it with other sci fi movies of the time, it's as if Disney had another space epic like MGM's Forbidden Planet sitting in the can for 20 years and finally decided to release it before 1980 rolled around. It's a wierd movie, and in its way a beautiful film, and you can love it for that, but it's also a partial answer to a needless what-if, had a TOS movie been made with the full color 60's sets.
Even if they'd been available, using TOS models and interior sets in 79 on the big screen would have looked absurd. 2001: A Space Odyssey, Star Wars, and (sometimes overlooked now) Close Encounters, had simply changed too much what a film audience expected by then from space ships.
You can see a contemporary film, The Black Hole, where they did refuse to follow entirely in ILM's footsteps. Disney went in-house as always for effects and sets and the result is, well now it would be called retro perhaps, but if you compare it with other sci fi movies of the time, it's as if Disney had another space epic like MGM's Forbidden Planet sitting in the can for 20 years and finally decided to release it before 1980 rolled around. It's a wierd movie, and in its way a beautiful film, and you can love it for that, but it's also a partial answer to a needless what-if, had a TOS movie been made with the full color 60's sets.