In 50 years, we'll still grapple with the same problems: How to take care of the unproductive elderly, what to do about immigration, how to raise and educate children, how to provide health care and such, what level of taxation is appropriate, and who should pay, how to regulate the private sector, etc.
Of course, we'll have other problems to deal with, such as genetic engineering, pervasive IT and surveillance technology, databases, individualism, continual erosion of all uneduated work, the possible arrival of AI powerd thinking machines, that would be cheaper and better than humans at most tasks, what to do with production when it's no longer profitable to pay humans to do jobs of virtually any kind.
Politically, then, we'll be living in a rather different world. It's all a question of who's going to be represented. Barring major changes to the way we have elections, I think we'll still have two parties, and I suspect that one will embrace a future society based on technology we can't yet envision, and that the other will fight to keep the better elements of the past.
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