1. The US will still reject the metric system.
2. The quantity and variety of food crops will continue to increase over the next 50 years and there will still be people starving.
3. Small countries that have developed robust Sovereign Wealth Funds (Singapore, UAE, Saudi Arabia, Kuwait, etc.) will expand two tier economies/societies where "Citizens" have everything they need and "Non-citizen" workers will live in abject poverty. These will mostly be domestic and other service workers.
3a. There will be an ever growing population of nationless people who are not citizens of anywhere. Born to "non-citizens" and not accepted as citizens of the nations that their parents or grandparents were born.
4. The expansion of remote work will grow to include such things as operating construction, farming and mining equipment offering "the benefit of foreign workers without the foreigners." This a paraphrase from the movie
Sleep Dealer. Great movie and hits the nail on the head.
5. The first remotely piloted commercial plane will be operated. Likely a domestic flight within China.
6. The vast majority of electricity will be produced using solar, wind and other renewables as the money-men desiring the highest profits on electrical production push out the money-men protecting their existing investments in coal, oil and natural gas.
7. The ever elusive goal of electricity too cheap to meter will still elude society. Even as the cost to produce electricity per kWh will continue to decrease, those who own/control its production and distribution will still extract more and more wealth.
8. After an ever declining role of the monarchy under King William, King George of England will agree to transformation effectively ending the monarchy. Though George will retain his vast family wealth.
9. The great Cthulhu will rise from R'lyeh and eat the faithful first.