Far from it. Archive.org is a passion project funded and run by a moderately wealthy guy (Brewster Kahle). Or at least, he had a few millions when he started it, and I'm certain the org has been a money pit for him. Hopefully some kind of foundation exists to keep it going after he passes, but it's not a certainty.

Don't take it for granted.

I would be incredibly surprised if it never goes offline. It’s very fragile even if it doesn’t seem like it

they are under fire for their hourly lending policy for books, who knows, I don't think too big to fail applies here

It's inevitable that they go dark. They piss off too many people regarding IP rights, and people hate to have proof out in the wild of what they said or did in the past. Plus a ton of other reasons; more people have an interest in it disappearing than have an interest in it surviving.

I mean, when it dies it will be a greater tragedy than the burning of the library of Alexandria (at least many of the books there were copied elsewhere), it will be a tremendous blow to our collective knowlege and memory.

But it's inevitable that it will go away.

Or it gets bought and shut down by someone who doesn't like what's in it.