Since i have family here on earth, i wouldn't take the trip basicly because i would never get to see them again. But in chase of they all died (very unlikely but still), then i would have no problem with living on Mars. For the love of god, you get to share your daily life with 199.999 other people..
My only concern is how/what currencies system they are gonna use and what they are gonna do in chase of a baby boom suddenly happening.
There will not be 200 000 people on Mars, that's the number of applicants. I think they was planning to send four people first, and then four more while the base was building. I have doubts about this project, but would be cool if they actually made it happen anytime soon.