Why would YouTube need to end? You could still search for videos, subscribe to channels, share them, etc. You'd just lose the sidebar.

Actually YouTube will be able to survive, for example by opening up their platform and API to allow users to bring their own discovery and recommendation engines. An ecosystem of SaaS enabling users to no-code build their own engine, or one click-install open-source ones will here be enabled. And since the goal of users is not to maximize engagement but to protect their health and find interesting content, this will not lead us back to the current state of affairs. Very few people will choose toxic algorithms, and at the very least people will now have choice.

YouTube would still be able to sell ads, but it will be the dumb pipe it was always supposed to be under section 230. This will be a much healthier situation with many regards.

I think the key thing is to stop considering that the current status quo is the golden age: there is so much abuse everywhere from misinformation and manipulation to wall gardens and monopolies, but somehow we've rationalized it and accepted it as a fact of life. What this law will do, is introduce some much needed rule of law in the digital landscape, and I believe create a healthier and even more competitive landscape.