Is the internet, in it's current form, finished?

I mean, we have our key players google, facebook and their like, is there room for another billion dollar website, or is the internet going to stay in it's same form till the next technological breakthrough.

I think this because I simply don't see room, there's nothing left, we haven't had another major player, another facebook enter the ring for quite some time now.

Sure there's always room for smaller websites to build up, but in terms of the big players are we now residing in a closed shop?