I know opinions here vary wildly about JJ’s Trek films, but personally I thought they had the right idea as far as casting goes. None of the crew are actually doing impressions of the original characters (except Karl Urban), but most of them nail the vibe. That’s what I want from a Star Wars recasting, because even if whoever they got was absolutely dead on I’d never be fooled. They ought not try to disguise the fact that they have a new actor, because that’s never going to work.
But isn’t that different since that’s a reboot, not something that’s supposed to take place in an existing canon?