For fans still recovering from what they'd hoped would be a wonderful return for Michelle Yeoh to the Star Trek universe, it's easy to point the finger at Alex Kurtzman, who has been running the franchise for over eight years now. Section 31 was originally going to be a series, but that was changed to a movie, and as it turns out, that wasn't Kurtzman's decision.
In a brief interview with CinemaBlend before the premiere of Section 31, Kurtzman was asked why the series got jettisoned for a movie instead, and he said, "I actually have nothing to do with that is the truth. Those decisions are made by people above my pay grade." He did admit, though, that making Section 31 into a movie made sense because of COVID, Michelle Yeoh's schedule after winning an Oscar, and what he called "a million different things."
But Kurtzman made it clear that the movies were outside his purview. He even went on to say, "as far as the larger vision for Star Trek beyond the TV shows, you'd have to ask Paramount." That doesn't actually tell us a lot because the executives at Paramount aren't exactly open about what's happening behind closed doors. But now we know that Kurtzman, in his own words, has no control over whether or not Star Trek: Prodigy and Star Trek: Lower Decks return as movies. So we can't expect him to help greenlight a Star Trek: Legacy movie, either. His sole focus remains with the television shows.
So if Paramount has already decided that Legacy is going to be a streaming channel movie, that could explain the reason why it hasn't been greenlit to a series. However, after the disappointing results of Section 31, streaming Star Trek movies may be place on an indefinite hold. So perhaps it's time to revisit the idea of a series.