Well, it's been established by PGP being deployed that the web of trust did not work well at all. So that option is out.
It seems like everyone is trying to find a way to make a global trust network (keybase, LinkedIn, etc.), when all you need most of the time are small circles of trust (dev groups, activism organizations, etc.).
I think the decentralized nature of WoT is actually a better way of structuring things, since it makes mass surveillance much more difficult.