"Getting the future right" is indeed tough.
Imagine trying to sell a short sci-fi story in the early to mid-60's, set in the mysterious and far-off 2004, but it's actually just based on today's reality with minor embelishments as to the actions of the characters, not the actual events, tech, "future history" or behaviors.
- The protagonist is a "Web Designer", he makes "web pages" for his clients to be viewed over a nearly universal computer network called the "Internet" that "nobody owns". The computer he works on only cost about $150 in 1960 dollars, and most of it's unfathomably high-tech internal parts were made in China or Malayasia...
The reader who can wrap his mind around the flying taxis and group-sex of "Stranger in a Strange Land", and 10,000 year interstellar empires of "Foundation" is thinking: "Web pages" and the "Internet" and why you'd want to "chat" on it, post pictures, sell stuff, copy programs, send "mail",? It would be so alien as to be nearly impossible, even for the hard-core sci-fi reader of the day, to be able to connect with it. China and Malyaisia make all of our computers?
- The protagonist has a handgun in a caliber called .40 from an unlikely company from Austria called "Glock". And by the way, the handgun is half-plastic, and is also the most popular sidearm of American law enforcment since the 1990's. The magazine, also plastic is limited to ten rounds by law, while the police who carry the same model are allowed another three. He had to go to a special federally licensed handgun dealer, and have the FBI called long-distance to be sure he wasn't a criminal before it would be sold to him.
The 1960's reader's reaction will be: Plastic? Austria?
Three extra rounds for the cops? Why? Call the FBI before you can buy a pistol? Please.
- Other background points, The Cold War is over, the U.S.S.R. is gone, replaced by an almost friendly "Russia" and it's former satellite neighbors, now independant nations with chairs at the U.N and everything. China is an bigger economic threat than it is militarily, and two of the tallest 100+ story buildings in New York were demolished by airplanes hijacked by Arabs with Pen Knives...
We sent men to orbit and land on the moon a few times in the late sixties and seventies, but haven't been back since. We share a "space station" with the Russians, which is an unimpressive collection of cans and solar panels. We're cooperating with the Russians not in some grand gesture of international cooperation, but really because they're cheap, due to all the poverty left in the wake of the former Soviet Union. America had four "spaceships" but we're going to mothball them because they have a nasty habit of blowing up on launch, and burning up on re-entry killing all aboard.
Corporations can muster billions to pay NASA, China, Russia, and the ESA to launch satellites to beam something called "Music Television" , that dosen't really play much music BTW, across the globe, but NASA can't get funding to go to Mars...
At this point, the reader has given up and will never read you again should you ever be so lucky to have another editor decide to print you...