Exactly! There's no limit to the number of virtual worlds on the internet; it's essentially a website with VR "pages" (locations).
In the long run, you'll need some major reason to visit. Entertainment companies like Disney, will wind up running their own virtual worlds with their own copyrighted material, which will be in "locked gardens". The first popular VR world(s) will probably wind up doing well (IF they are smart), much like FaceBook, Google, Amazon, or eBay.
Just like the various bit coins, I wouldn't recommend spend/invest any significant money in VR "real estate", at this point, no one can guess the eventual victors and you could end up owning shares of Alta Vista instead of Google. Short term, it might be OK, but you'd need to get out before the "pyramid scheme" topples.
What's "Alta Vista"? That's my point... no one uses it any more, but at one time it was the main search tool on the internet.