Aside from Star Trek's previous metamorphsis from TVH to TNG?
So, movie franchise to TV franchise, as opposed to the other way round? Is there a precedent for that?
Yup. Stargate. Buffy too I believe. Neither show used the same actors as the films, IIRC.
Not in the principal cast, though Alexis Cruz (Skaara) and Erick Avari (Kasuf) have both reprised their Stargate film roles in the TV series, and an argument can be made that Kurt Russell's Colonel O'Neil exists in the TV show's universe - there's an episode where O'Neill tells a reporter, "It's O'Neill, with *two* L's. There's another Colonel O'Neil with only one L. He has no sense of humor at all."
But yes, there are precedents for a franchise moving from the theatres to TV.