The Next Generation was canceled after 7 seasons, though nobody seemed to be quite sure why. There were suggestions that the salaries were getting too high and new Trek shows would cost less because of lower salaries for those actors, and there were suggestions that Paramount thought a film series would be better than the TV series and that both could not run at the same time, and so on and so on. TNG itself was certainly very profitable and successful so the cancellation seems odd. TNG was also the last really successful Star Trek series, save perhaps DS9. Of note, TNG also seemed to have set the trend, as the rest of the series were canceled after 7 seasons, save for ENT.
So what if TNG was not canceled after 7 season, and continued for a couple seasons more?