I'm more partial to peer to peer without tor. If I know the IP (or domain...) of just ONE "gateway" that helps me with discovery of peers and other gateways I care about, I can hop out from there. 
Plus this de-globalizes DNS: *this* gateway has abc.com registered at IP 1234 while *that* gateway has abc.com registered at IP 9876. So different voluntary communities can have their own little darknet of domains and peer to peer networking. 
If there happens to arise a very large and reliable gateway that "everyone uses", it could be considered something like "global", but Exit would *always* be on the table.