The only problem I see with hiring an attorney is that being such could be a weakness. An attorney is bound by some rules normal people are not. It is a bigger ask for an attorney defying a court order than for a normal person without a law license to be yanked.
Tor is a tricky beast. One can see a day where those in charge may have to take drastic actions (think lavabit). Perhaps a non-US person, or cross-boarder team, would allow tor to better survive an existential crisis.
If that's the case, Roger Dingledine is probably the one that should become a non-US person, given he is still leading the technical side of things from what I can see. He could be NSL'd just the same. At the end of the day, Tor is an American project, and still has to play to some extent by American rules. Doing that above board is really all they have.
Tor is a tricky beast. One can see a day where those in charge may have to take drastic actions (think lavabit). Perhaps a non-US person, or cross-boarder team, would allow tor to better survive an existential crisis.