I wonder if they would send a team on a one way trip or find a way to return them. I can't imagine being one of those people sent there. It would be exciting, but scary as hell too.
Initially it will be one way trips. Then a permanent prescense will be establised. We to mush materials are needed for the first time landing to be a one way mission.
The onyl way around that would be to have multiple spaceships enroute to Mars before the first one ever reached there. With air, water, materials...I think they will send military types personally. Career men/women that have not had the time or desire for a family.