In a few weeks, 1% of creators already using YouTube Studio will no longer see the ‘back to Classic’ button – you’ll be notified 1st & can still access Classic features you need! This won’t apply to everyone else until early next year. More info → https://yt.be/help/a7mG
There are things I like about Classic, and there's things I like about the new studio as well. But as long as Classic still has functionality that new doesn't, I really hope it doesn't get removed entirely.