I don't think "lots of people" are going to living in Mars anytime soon. Before we start sending any people, we would be sending a whole lot of other equipment to send us high quality data about the environment before we are ready to start sending any real humans.
Personally, I think we should never send any humans ever to Mars. Humans will not be leaving the solar system anyway and glamorising the idea of humans being in Mars could just unnecessarily delay going further with life.