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All utopian literature, which includes sf, is about the present. This means that it often doesn't age well, but it also makes reading older sf a fascinating history through time. (This is particularly pronounced if you read short stories). Starting in the 60's, we started to sf that took ecological issues seriously for the first time - I think "Dune" was the first popular novel to take that approach; see also "Deathworld." A lot of sf from the mid 70's reflects the "oil crisis," for example, with fuel shortages being endemic and people using energy saving vehicles. There is also a lot of sf from the 50's and 60's that deal with corporations oppressing consumers (different from the later corporations=governments theme). The late 60's and 70's brought us a few important works dealing with sexuality (Left Hand of Darkness, Philip Jose Farmer), although most mainstream sf was still pretty prudish into the 90's.
And of course there was a whole cold war component to much of the 50's-early 80's sf, often with future earth being divided into various "blocs" - but just as often worrying about whether "free" people, with various distractions, would be able to fight implacable militaristic foes aimed at their destruction. And Joe Haldeman and others brought us Vietnam themes in the 70's.
The 90's brought us computer themes, especially cyberpunk, and the singularity.
So a good place to look for current sf themes would be in issues of current concern today. I don't think that this will necessarily relate directly to technology, though, unless it is the technology that causes the particular concern. "Dune" or "The Forever War" weren't about a particular technology; nor was "Star Trek," where the technology really only existed to allow them to get from place to place. On the other hand, since computers, specifically, were both a technology and a cultural phenomenon, a lot of works over the past 20 or so years have made the tech the story in a way that was not that common before - where the tech either was there to enable aliens to be present (so as to better reflect on whatever human concern we might have), or else it's there as a flavoring item to show that this is the FUTURE! (I often thought that Starfleet personnel would be better served if they had pistols, rifles, shotguns, and submachine guns instead of phasers...but it's the FUTURE!. (And I feel sorry for the handful of writers in the early 90's who used Cold Fusion devices.)
So I'm not sure what themes might be viable. "Occupy Starfleet?"
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