Except Annikin was a slave. And we have all the Jedi from the prequels and their backgrounds. It’s nothing like a caste system.
Leia is a Princess by adoption.
Luke was a farmer.
There’s nothing inherently “royal” about them. And the Force flowing in families isn’t new. It also isn’t limited. For some reason a section of movie fandom has latched on to this. Ignoring that there were many differnet types of force users. Even after the Disney acquisition, the history of the Sith and Jedi persist as well as the Nightsisters of Dathomir, and the various Imperial force using sub-sects depicted in The CGi “Clone Wars” cartoon and its sequel “Rebels” which are fully Disney canon, especially since “Rebels” is a Disney production and small easter eggs from the show made it into Rogue-One…
Back to the force: It was never a caste thing. The movies just focused on the Skywalkers. Now they’re all dead (Yes Leia lived, but Carrie Fisher is dead). So, no more Skywalkers. There will still be force users. I have no idea why this had to be explicitly stated when it’s always been the case?