NASA has long wanted to send a manned mission to Mars. In fact, many NASA scientists would like to eventually colonize the planet. There likely will be colonies on Mars in the far future. As space travel continues to advance and become more commercialized, there will likely be some that would want to travel to and live on Mars.
Science has progressed in leaps and bounds over the last century so there's no limit to what can happen in the future. I'm sure some scientist will have an eureka moment and figure out how to make air and water out of almost nothing and just like that we'll be able to colonize other planets.
Scientific advancements, particularly in the world of space exploration, have been accelerating at a rapid rate. This indicates that it is only a matter of time before those advancements make creating a colony on Mars a reality. People should expect to read headlines about life on Mars very, very soon.
There are lots of problems with colonizing Mars, specifically it is not designed to support human life. There is a chance that we may one day be able to send people to Mars to visit for a brief period of time. This is what these astronauts are training for, not colonization.