I find this fascinating. Have you done tht with any previous books? Seen them published but only allowed the use of them bit by bit? I don't think I've ever heard of anyone doing that.
Saying "we're using the this stuff, not that stuff" is IMO the most common thing in the world, so I'm not sure what you mean?
Seeing something published doesn't mean (1) I've bought it and (2) read it (3) liked it and (4) decided to using it is worth the effort required to change things. Money, time, and effort are all limited resources.
If I were to read the next edition, I might well decide I like it better, but I'm honestly not super interested in reading
another D&D rulebook this year, let alone several. I haven't really heard anything about the coming edition that makes me think spending time reading it isn't better spent thinking about the campaign or worldbuilding.
If I do read it, and the I have a 5e game running. I'm 100% not going to do a reset of any kind, but introduce the stuff that seems like it would improve my game piecemeal.
If I do read it, and I don't have a 5e game running, and I decide I like 5.5 better, and the campaign I'm want to run is sufficiently compatible (How compatible is say Ptolus 5e with 5.5? I don't know!), it will be 5.5e... but that's not a reset either, just a new game.
Honestly, the idea that someone would "reset" a running game because a new edition came out, unless they were deeply unhappy with their current ruleset is just alien to me. I can
transitioning as smoothly as possible from eg, "rules I have problems with" to "rules that seem clearly better". I don't understand a reset, especially if the rules don't seem broken in your game.
EDIT: for clarity - I don't currently have a 5e game going. I'm considering running Ptolus using either Cypher or 5e once one of my current OSR (Macchiato Monsters) games finishes.