I am surprised that people DON'T want a contemporary/near future age. Even Civilization, which released nearly 35 years ago had computers and the space race represented in the game. Civ II had stealth bombers, lasers, super conductors, nuclear power, and that game also came out in the 1990s. I hope the contemporary/future age is the last major expansion, and comes out 2 or 3 years from the release of Civ 7, after the team have really figured out the limits of this engine. Plus by 2027 or 2028, AI, robotics, medicine, space exploration, possibly even fusion power would all be even more advanced than they are now.
If this expansion adds 150 turns past 1950, that would put its end date from 2025 to 2100, depending if year year was one turn or 2 turns, or a combination like the first 50 years are 1 turn per year, and the second 50 years are 2 turns per year. If the game ends at 2050 and comes out in like 2027 or 2028, it wouldn't require straying too far from history into science fiction, though a 2025 or 2030 end date could make it even more grounded. I could easily image a situation where people are still playing Civ 7 in the early 2040s.
Everything from the Moon landings to mass television broadcasts, to the internet, smart weapons, smart phones, drones, and AI should all be in the game. Plus with the age mechanics, it'd be easy to through in corporations/companies, NGOs, satellites, ICBMs, MAD, SAMs, etc.