. The conditions you're describing -- a flood of Star Trek catalog titles on home video -- is no different than the early 2000s. (Actually, on DVD, TNG came out at a faster rate than it has on Blu-Ray).
The difference between then and now is that in the early 2000s there was a theatrical movie on the horizon and a Star Trek show on television; now all we have are the movies. If the market is currently saturated with Star Trek then it has been saturated for two decades.