This is honestly the best way I have ever heard this described! It really is that 'end of the road' feeling that I get, once I have experienced a large chunk of the game loop, that has me disconnect from games and feel hollow.
This is probably why I keep going back to huge modpacks for Minecraft with a friend. It is so open and expansive, with so much to do, that you never really feel like it's the end... You just feel like you have had your fill, until next time.
I personally only got to watch my older brother play UO, and then he brought me into the launch of WoW which was a pivotal experience. But the end game always felt like it falls flat.
In an odd sort of way I suspect UO would have been better off had it come out a year or two earlier. It'd not have been remotely as popular, but wouldn't have attracted such a large crowd. And because they drew from a much larger crowd than the intended audience there were a lot of people who got disgruntled. But it makes sense because the game was literally not designed with their desires in mind.