In The Original Series in the 60s, people had no idea what the future would look like or what technology would look like. In one of the early episodes, they had a paper print out machine on the bridge that looked like a fax machine, which was considered futuristic in the 1960s.
Like the example of the Enterprise fax machine, what technology or system do you think are we displaying in the current Star Trek shows that will show how dated we will become in the future?
Direct-fire ship-to-ship weapons. Modern war is more and more about missiles, drones, etc. I think in the future the idea of ships coming near each-other and shooting directly will seem really old-fashioned, even if they are using space lasers.
I think that future tech will have much smaller craft or technology to move people from one star system to another.
The giant starships we highlight in the shows today will be looked at in the future in the same way we look at people in the 1900s who thought that big giant cruise ships over the ocean would be the best way to travel around the world in the future.
The choice of drugs. Star Trek is all about alcohol (often alien alcohol) and caffeine (sometimes alien coffee). Any time any other drug is shown / mentioned, it's because it's a big enough problem to be a plot point. I think 20 years from now, a few light drugs, including marijuana, will be so common that it will seem strange that they're not part of society in the 23rd century.
Purely in-person meetings, or pure 1-1 video calls. In modern offices, we're seeing more of a hybrid setup where some people in the meeting are in a room together, and other people are joining remotely. My guess is that in the future
Like, if Geordi La Forge leaves the Jeffries tube to attend an in-person meeting instead of joining in remotely so that he can keep working the problem while keeping everyone updated, that will seem really weird.
I've got one better: in at least one if not two instances, Spock uses an E6B flight computer (a specialized aviation slide rule, WWII technology) to calculate a time of arrival/impact problem. They're still made and sold today for student pilots but they're definitely outmoded.
I'm not especially optimistic for our future, so I think what will date us in the future, if we're around much longer, is the technology we have that they can't anymore.