I didn't have any intent to troll, I just created this account to ask this question. I think it's possible to have a meaningful discussion about large opportunities in the internet's future.
Alright, I'll take you at your word. The question is kind of ridiculous though; there are new billion dollar companies created pretty regularly; what makes you think that's stopped happening?
The opportunities for creating tremendous value may move elsewhere, and the web may simply become a utility. It became a lot harder to create a profitable car company after the automotive industry matured.