You think in 50 years real actors won't be replaced by 100% realistic CGI?
If you ask TNG, humans outgrew the need for petty things like TV, and celebrities.
If you ask any other Trek series, there probably are still celebrities but they're not actors and singers, they're writers of holonovels, composers of music. The actual creators.
Actual popular entertainment is probably faceless. No names attached, just characters. Kind of like how entertainment companies wish they could make it now, but can't because there isn't 100% realistic CGI yet.