I honestly saw this coming.
In my opinion, this is the sensible path, the Mane 6 and other's stories and character developments are complete, so continuing to use them as main character would lead to nothing but meaninless stories, and a general disservice to their character.
I will very much miss them however, but I'm glad this was the desision that was made.
I do however, want to see continued references to g4, like in the g5 movie.