I can agree that .com is cluttered (with non-companies, even), and that a wider and semantic namespace could be a good thing.

But in my example -- I can't imagine a site that belongs under exactly one of these TLDs. So any site that falls under one of them, conflicts mentally with a site of the same name under at least one of the others. So this hasn't expanded the namespace at all.

Instead, it has poisoned the namespace. Did you want joe.photo or joe.photos? I literally just made up that example, and oh look, it's the same site. Of course it is; the moneygrab was successful. Because otherwise, users will not remember which one was right, and the two sites are competing for the same name with the same meaning.