SF is more than just a genre that responds, knee-jerk fashion, to the issues of the day... though it has obviously been known to do that. SF also looks at the Big Picture, the long-term view, which tends to smooth out the bumps and valleys created by changing political views and leadership. The American government has made little progress towards obvious changes, pro or con, primarily due to its own inherent contentiousness. We are still in an era where big business overtly controls government, or minimizes government's ability to adversely impact big business, and the people accept bread and circuses to avoid making waves. These trends have been influencing (American) SF heavily in the past few decades. I think we need to see changes to that logjam, in order to give writers a reason to see something different on the horizon. But don't forget: A lot of SF is built around what sells, and scary dystopias have proven to be much more popular book-sellers than utopian lit.