I'm not sure what is meant by "outdated" when discussing the "Science-Fiction Adventure in the Far Future"!
Aside from that, what is in the "larger SF universe" borders on fantasy rather than hard science, even though Traveller includes rules on Psionics.
My adventures tend towards hard science-fiction, with a very few gimmicks thrown in, like gravity control, faster-than-light travel, and and experimental laser pistol or two.
I avoid things like divergeant timelines, time travel, psionics, ghosts and the supernatural, and any life form made of something other than normal matter (and I'm especially prejudiced against the possibility of non-carbon based life).
So, what if...
Setting changes:
... an Ancient installation on a rogue planet thaws out, releasing a threat that's very much like Saberhagen's Berserkers (NOT Roddenberry's Borg). Only these are re-awakened leftovers from the Grandfather wars, and Grandfather is off on a holiday for the next millenium or so...
... The Empire only
seems benevolent, with silent, sinister agents making people disappear for no apparent reason ("Two by two, hands of blue.")...
... Jump space rendered people incapable of producing offspring. Of course, at J-1 it would take 30 years or so for the effects to appear, but by then it could be blamed on old age or anagathic use. The truth is that once J-6 technology becomes more prevalent, people start losing their reproductive abilities in 5 years or less! Cloning becomes fashionable...
... Another Humaniti race is discovered. Refer to previous posts on the Imperial Stellar Socialist Republic (ISSR) for details, comrade...
I'll think of more when I'm not supposed to be working.
-KR-