I would have thought the CW might have been more interested in rebooting a property like Firefly but Disney have The Mandalorian and its spin-offs so it'd be difficult to compete in the SF/western cross-over genre. I don't know if the rights are available anyway. It might be time for grand space opera to be in vogue again after all the countless iterations of superhero stories.
Firefly's a Disney princess now. As are Buffy and Angel.