There will be a rush of US startups to replace it, and they will all be stage 1 enshittification, so they might actually be good for a while, like TikTok once was.
yt doesn't even need tiktok to fail. they have a winning formula going for them rn already. creators make shorts from their longer form content. the shorts are promo for their long form. creators get views for both forms. it's been going really good for them so far afaik.