People will only go if there's a genuine chance to come back. Even the most gung-ho space cadet on the planet will have enough nous to have this in his contract.
I think they'd get takers, but a large number of them might not be well-adjusted to society, which could be part of the motivation for leaving.
Whoever is funding manned missions to Mars isn't going to choose maladjusted sociopaths, even though that's what they're going to get volunteering to go.