Yeah, Star Trek on UPN was up against it a lot of the time.
It's interesting to think what could have happened if TNG had continued. Patrick Stewart and Brent Spiner would have eaten up a lot more of the budget, but I would have thought that with a hypothetical 8th season, there wouldn't be any VOY or GEN to distract the producers. Seasons 7 and 8 may have been more on season 6's level of quality. It's a very hypothetical situation though.
What I think should have happened that might have been beneficial, is for GEN to have been put into production after
TNG finished. VOY was distracting enough for the producers, so leaving the film till things were up and running may have been sensible.