If you feed them a constant stream of new content, yeah, they'll probably be that way, but they're not born with an insatiable desire for novel consumption.
I think it depends on the person. Other than a few favorites, I've never tended to rewatch movies, reread books, replay games, etc. I think that a lot of it may be that a lot of the appeal to me is in "figuring out" the content so that once I know how things play out I don't care all that much about reexperiencing the playing out itself.
I don't think that's a good argument. You find "new" when rewatching. The moment is not engaging anymore, it means you drained the entirety of the content