I certainly do believe the human race race should expand beyond the Earth, we'll have to. However, this should be done when we're technologically ready, when we can mount realistic human expeditions with the technology to return if we wish, and have the technology to create a realistic human habitat on another world. Currently we are not technologically ready, not by a long chalk.
I think the first off world human habitat will be on the moon, it will be done by one of the superpowers, most likely the USA, and regardless of who builds it, it will be a helium 3 mining operation.
Edited by Occams Razor, 28 April 2013 - 01:10 PM.