Yeah, if one had not already moved off of 5e, I dont really see what 5.5e does to push them away. Its just more of the same, distilled even.
As someone who has been through more edition changes than fingers on a hand, there is more to it than just irrelevance since it doesn’t technically affect your specific game.
For what it’s worth, there is something about a game system being bookended and no official support for it coming. Game systems are more important to a lot of people than they probably ought to be, and we end up with a lot of vested emotions wrapped up into them.
Add in that 5E is the widest played version of the game ever, and for a lot of folks, 5E
IS D&D.
People change as they age as well, and depending on where one is in life’s journey when an edition change occurs, it can also just remove you from the game. I know that happened with me in 2000 when 3E was released. I had just joined the US Navy in late 1999, and the thought of trying to not only rebuild my game library, but to do so with an entire new group and a different phase of life just let me walk away from the hobby completely until I got coaxed in DM’ing a 5E game for some barely out of college 20-something’s in 2016 who didn’t know how to DM but wanted to try this thing that was becoming popular. That campaign lasted until last year.
In defense of 5E, I still have little actual understanding of the rules, which honestly says something about the game system if a guy who hasn’t ran any D20 stuff could basically “wing it” for basically a decade and run converted on the fly 2E material for a 5E group.
I’m not particularly upset about 5E being “dead” either, but I can imagine that there are people who would still have some sort of emotional attachment, even if they aren’t necessarily angry.