I think you'll see more fantasy shows which honestly Star Trek and Star Wars kind of are.
Tonight I was discovery thinking about that, Romulans and Vulcans are space elves, I suppose Klingons are dwarves, Ferangi goblins. On this particular episode they went on a downright quest to a magical monastery with magical time crystals all while spending the season looking for an angel. That's a fantasy with space undertones they threw science right out of the fiction for that episode.
So more dragon's, knights, castles, less space ships.
"ST" & "SW" both fall under fantasy thanks to FTL, if nothing else. They're much harder than Tolkein or Howard ever imagined.
That said, you make me think it's possible "ST" (at least) is replaced by something closer to "Dark Shadows" or "Kolchak": "Supernatural" two decades early?
Doing anything as ambitious as "LotR" is impossible with period appliances & SFX. (Recall the Gorn in "Arena", & the ape masks in "PitA"
were groundbreaking for the period.)
There'd be a
much smaller fanbase to support any show that got made, & much smaller pool of SF TV writers (which is a pretty small pool to begin with), meaning the average quality of any show made is liable to be depressingly low compared to OTL (& OTL was, generally, pretty abysmal).
If there is a stronger fantasy bent (which I won't rule out, though I'd oppose it; I'm on the Heinlein side of the fence, myself
), it's likely to look a bit like live-action "He-Man".
It's
just possible, tho, we see something
very interesting: Muppets doing drama.
Henson was always looking to expand horizons--& I can't help recall,
"You've got a little demon in you."