No, but at least I suppose that pages are bounded by size, because of the memory of the generator, or of the viewer. Say the maximum size of a page you can build is N, then there is a maximum finite value of different pages / urls you can fit in N too. So, even if you have infinite time, with your finite computers you'll have finite amounts of pages.

Now, if you are going to have pages and urls that are bigger in size than the memory of even the biggest computers in the world, so that you can't hold them in memory at any time, then the point above isn't useful for you (and in this case you are right). But urls bigger than memory are probably useless, even if webpages bigger than memory aren't.

And if you have to have urls that are finite... then my point holds: even in infinite time, you won't have infinite amounts of urls.