I always say look to Marvel as the template. Avengers is the end of their "phases" so maybe a similar thing with Star Wars. But the Episodes come at the start. So, therefore, Ep 7, Boba Fett & Han Solo flick out each year. Maybe even a Yoda. Episode 8 = ST character spin-off, maybe a spin-off sequel to phase one spin-off Boba/Han/Yoda, maybe an Obi-Wan flick. Ep 9, then maybe a post-Ep 9 spin-off but not a proper "episode" sequel. From there to infinity and beyond. Which means a Buzz Lightyear crossover!