What do you envision in 30-50 years? Mind you, by "envision" I don't mean what you would like to see, but what you think is likely to actually happen.
I haven't been ignoring this question, I have been thinking. I'm not sure you really can answer this question. There are too many enormous changes just on the horizon, either for good or bad, and which ones happen depends on only slight variances in direction. Too many factors -- and really big factors all -- to crapshoot such a thing with any kind of accuracy.
Assuming for the sake of argument that we are not in or going in to the Kingdom on Earth by that time, technological capability will continue to grow exponentially and stuff will be commonplace that even today's best scientists would call 'magic.' Something akin to the "tech singularity" is coming, and whether it levels off due to sheer comms bandwidth or does something else we will continue to see mind-boggling progress.
I am 41. When I was young public phones were rotary. Kids today won't know what it's like to be tethered by a cable at all. A broader "datasphere" will emerge from what will become of the Internet and cell traffic and vpn (cellphone/skyping across VPNs over internet with celltower gateways and such.) <<-- is already emerging. Handhelds with "data only" and apps for voice and video that will call any telephone in the world.
There will become a broader "datasphere" of which the internet will be only a part. The widespread adoption of IPv6 will create a physical layer upon which this will map. A smart service provider will put cell-to-voip gateways in 10 major cities and partner with other Internet to POTS providers to provide ubiquitous coverage. "cellphones" as we know it will go extinct, and you will carry a 'port' to the 'datasphere' of which voice communications will only be a part. What we have now LOOKS like that, but it is not that yet.
Communications will move "at the speed of thought" and popular attention spans will continue to drop proportionately, but information will be an order of magnitude more free and available than it already is. Instead of getting frustrated at a lack of good search results from a search engine, you program your own AI to search the Internet, and provide guidance and search refinements while it works in the background.
The world will be separated into the data world and the analog world. Nations will matter less. First world third world may be referred to in the colloquial or jokes, but the real divide will be connected vs not.
Politically, well. There is too much big stuff that could happen between now and then to even hazard a guess. The obvious one is China will continue to grow in influence until their own attempt at Keynesianism finally collapses, also. Will that be before or after they have the biggest defense budget on the planet? No idea.
Unless more people wake up (highly unlikely) and reject the status quo, then America's star will fade. Which ultimately may be good for liberty folks for America to become "irrelevant." Because that, at least, will force a change.
Wearable computers will proliferate. Whomever invents a real tactile hologram is going to be the next Bill Gates.