In his book, the Next Hundred Years, George Friedman speculates upon the kind of technology that our society will develop within the next decades based on what he thinks will be the logical steps taken by our economical and military needs.
First of all, he projects the occurance of a massive labor shortage crisis during the 2030's, which will help push longevity technologies. But longevity aimed at lengthening the average worker's career, not aimed at making people live longer. He also speculates the labour shortage will also boost the biggest leaps in robotic technologies, but these leaps won't actually be fulfilled until about a decade or so too late, way after the labour shortage problem will be resolved with an alternative, but radical, solution (US and western countries becoming agressive promoter of immigration from poorer countries, rather than having quotas).
Also, he speculates that since Russia's current re-emergence use mainly its energy production as the main leverage to secure loyalty from allies and client-states, the US are probably going to be investing heavily in alternative energy development and production in order to rehaul their allies' economy so they will stop being vulnerable to Russia's blackmail. In short, the world stopping fossil fuel will be achieved not because of any environmental motivation but merely geopolitical incentives (which, I believe, is a stronger social force than any appeal to the people's goodwill and conscience).
Another field that he expects will be developped is a more casual space travel, with an increase in the level of satellite technology will make it an ever greater strategic concern for the US and any power that wishes to have any kind of influence. Global-scale firepower will probably be fielded through a fleet of hypersonic bomber drones acting on the intelligence of satellites, and controlled remotely with a developped satellite communication network.
Since satellite integrity will because vital in maintaining national security, there is a good chance that strategically critical satellite will be defended by a security cordon of defense satellites with lasers and other weapons of the kind. Like there is currently a whole fleet sourrounding a carrier, there is going to be a whole satellite fleet sourrounding the spy/communication sats.
But with time and bad luck, satellite always breaks down. The increase of number and importance of satellites will eventually make the cost of re-launching replacement satellite prohibitive, and the US will probably start to try to repair their damaged satellite rather than outright replace them. However, launching a new manned shuttle every 3 months to repair half a dozen sats will also end up being prohibitive, and so will probably be born the first manned space stations with having an economical purpose. These space stations will be used as the core of the satellite repair effort.
With time and with the proper economical incentive, these manned stations will grow in size and in scope as the technology used will be perfected, until they end up being geostationnary installation. They will probably be built, owned and used mainly by the US.
The biggest leap from there is as such: when we reached a technological level where we can safely launch manned space missions on a casual basis and built large-scale space installation, it can be safely assumed we could then build massive mirror arrays in the Lagrange Orbital Points (which will become key strategic locations). These massive mirror array will focus the continuous available solar energy and redirect it toward earth in the form of microwave beams, which will be caught with arrays meant to distribute the energy on earth. And thus we have the ultimate source of unlimited solar power, easily distributed everywhere in the world (where the solar array can reach with a beam, obviously).
Off course, it's all speculation. But it's speculations based on projected economical trends, and I like to believe economy, military and social forces have a big say in the direction and speed of technological development of our specie.