Isn't animated content the precursor for this? Bugs Bunny and Mickey Mouse 'live forever'. We might also take a little from recast characters over time like James Bond, The Doctor, Captain Kirk, Superman...

I guess if we mean actors separate from characters it's a little different. Though I think wr still might take something from Bugs Bunny who's been in various shows, movies etc. And the famous part is the character, you have to be a big Bugs Bunny nerd to know or car about who is doing the voice or animation or writing really. So that might well be where we go - the character is tied to the brand / company that owns it but no particular person.

I don't think there's gonna be a big backlash really. This may make actual actors in movies like the etsy handcrafted stuff vs the knock off brand on Amazon, but both have a market. The "more expensive" real market might well shrink a lot and if you want to be an actor you're back to actual stage performance.