For now. Check again in a year, there's a good chance it won't be there anymore.

I support decentralization and do agree with you in principal (and I youtube-dl any video I care about), but in practice I've actually seen the breadth of content expand. You can even find clips of The Simpsons on there now. (of course there are the high-profile examples of political content being taken down)

I do not disagree. I've seen both, really - on the one hand, I find recently uploaded clips of old things; on the other hand, I recently scrolled through my "likes" list on YouTube, and something like 1/4 of it points to removed videos.

Same here. While it's not a system I'd like to trust the future to, I see it continuing to pass the "I mean, where else are you going to get a copy of The Mr. Belvedere Show theme song?" test for the foreseeable future.

In which case, running youtube-dl when you discover something you want to keep around for good is going to be a better solution than Napster.