TNG had a few reasons for ending at 7. The actors were getting expensive to sign. I think they had 3 year contracts and they got that 7th year with the understanding that it was ending and they were going on to movies. Patrick Stewart was ready to go, so I think the film was an enticement to get...
Well I would imagine that by the 90's, especially the producers of Star Trek - a show that was a huge part of reruns being lucrative - the thought to future proof their shows would be a little more commonplace. If any series defies the "one and done" mentality, it would be a Star Trek. Once TNG...
Well they could go the less intensive route and do what was done with shows like SeaQuest. The effects-less scenes were restruck from the film masters and the effects scenes were up-rezzed. Not perfect but not totally awful either. While some scenes, especially in SeaQuest's first season, look...