And to "future history" fiction generally...

... for instance, Orwell's 1984*, Clarke's series that began with 2001, and Heinlein's early work (which may have coined the phrase "future history", come to think of it).

Let this be a lesson: If you feel the urge to write future fiction, don't put an arbitrary date on it ... especially if it's near-future. The cyberpunks didn't, so as the present merges with the VR futures they envisioned, their stories gain relevance, rather than lose it. Even so, they'll become dated, too.

As to the ST universe specifically... Roddenberry made the mistake of being too specific about the transitions between our timeline in the mid-'60s and the Federation of TOS. It came to a head in (i.m.o.) the best feature-length NextGen film, First Contact. There's just too little time between us and Zephraim Cochran for anyone but the most delusional fan to believe that we live in the ST worldline.

Shortsightedness from an SF writer? It happens... we're all prey to the idea that 40 years is a long time and anything can happen. When we get the chance to look back, we're often as amazed by how much didn't happen as by how much did. Ask anyone 50 or older about the future we read about in 1960.

And while we're on the subject ...

Among other faults, Enterprise suffers from a total breakdown in continuity. It's painfully obvious to someone who, like me, has an eye for the spacefaring equivalent of "naval architecture" (i.e., starship design), that the pre-TOS Enterprise is a descendant of the NCC-1701 series, not an ancestor. Roddenberry's successors, by creating a "prequel", saddled themselves with their own cognitive disconnect between that time and Kirk's 24th C. ... and they did it with something as simple as art direction.

But -- UPN did the worst thing they could have done to Enterprise's survival in the ratings. They moved it to Friday, opposite Stargate SG1.

--------
[* - There was a time, in the early-to-mid '60s, when the only place you could find 1984 was the SF paperback racks -- same thing, at the time, with Huxley's Brave New World and Ayn Rand's The Fountainhead, among others -- because mass marketers didn't have enough pigeonholes in their head. To them, "future = SciFi".]