When history has had more of a chance to unfold, I doubt that this generation being discussed will be defined by Obama, in say, the way that an Andrew Jackson or Franklin Roosevelt did for their times. But the left end of this generation's spectrum looks to be chasing illusions that are not likely to pan out.
First, it is quite likely that Iraq (as a major issue,) will die out as the war winds down by next year's election and other ones (like immigration) move up. Second, global warming, as such, is not a sustainable long-term top issue, although secondary problems coming from the sun's heating up may well be severe. Part of that is the sheer boredom and inertia in sustaining any issue for too long a term.
If only we could know what issues to look for for ten years from now.