Griffin Boyce:
There's really nothing keeping you from making a private bridge network.
The documentation's all there.
Indeed. One can even make its own (private) Tor network. It will require
a considerable amount of learning, though.
It would be interesting to see several competing Tor networks. May or
may not happen in long term future, if Tor can attract much more users
and relays.
Alex probable won't be up for creating an alternative Tor network with
that threat model. As soon as you host a relay or directory authority,
it's difficult (impossible?) to stay anonymous, you move yourself into
the target line by doing so.