Don Pettit, the ISS astronaut, would go, and he'd take his family with him:
SPACE.com: With over 300 days in space already under your belt, would you consider participating in a long duration mission, say to colonize another planet or moon? And what if there was a chance you couldn't return? (submitted by readers Tyler Crichton and William Stack)
Pettit: I would go back to space in a nanosecond — that's what I do for a living. Give me another couple of days here to get my feet on the ground, and I'm ready to go again. In terms of immigrating from Earth, I'd be willing to immigrate from Earth — immigrate into space, leaving Earth and never come back — so long as we had the technology so you could survive.
One-way missions to Mars where you go there and then run out of air and die, that's not in the cards. If you went to Mars, like people went from continental Europe to the New World in the 17th century, that model would be something I would do. I'd load my family up on the next rocket and we'd immigrate into space.