Well Yeah, they brought in OT actors in the so called sequels, and they brought Hayden and Ewan back and Genevieve from the prequel for Mon Mothma and Jimmy Smitts for Bail Organa.
As per the sequels whether a Rey movie gets made, I think the possibility of it happening before 2030 diminishes by the year.
Continuing actors or characters from the Clone wars and rebels in different projects.
Does the Lando show or movie get made I’d say its doubtful. The droids show about Artoo and Threepio live action I say that is dead as well.
Other than in voice over work or cartoons I don’t see Tony returning to play Threepio.