1. Interstellar is a phenomenal movie. But it's also not part of a franchise. No one's expecting a continuing series of Interstellar Films.So how does Nolan do it? He delivers spectacle after spectacle the way he likes it, the films make money and studios ask for more. You don’t need a programmed franchise, just a way of attracting talent. Even something controlled like the MCU is evidence that it’s all about the execution, not just a few well-known characters. Marvel Studios made a whole bunch of them famous.
2. I haven't watched very many MCU Films. The last one I saw was X-Men: First Class in 2011. So it's been 10 years. So I have no idea what they've been up to. But I can't picture them doing a movie like Interstellar.
3. The Abrams Star Trek Films aren't really my style, but I think they could've kept them going had they not squandered their momentum by taking so long to come out with them.
EDITED TO ADD: Before someone says, "You haven't seen the last 10 years of MCU Films?!?!! You need to watch ___, ____, and ____!!!!!!!!" No thanks, save it. I hear enough of that from my brother. Not interested.