Its a mixed bag.
I don’t remember a lot of specifics from my childhood, but I also wouldn’t say I don’t remember my childhood. I don’t remember the names of all my elementary schools, or exactly where they were, but I can remember most of my friends and what we did together. Like at my first elementary school I can remember that I basically just did normal kid stuff. I know at my second elementary school I got into videogames, because a lot of my friends from that school had gamecubes. But I can only remember a few actual individual times we were playing gamecube, even though we played together several times a week for literally years. I know mario sunshine was my jam but can’t remember any specific days I played it on. I know when I was homeschooled I spent more time on neopets than doing actual school (thanks mom), but I have literally no individual memories of playing neopets.
So like… I do know my own history well enough, but just not specific days unless it was something really noteworthy. I have no idea if thats “normal” or not.
I can remember medical facts really well. I want to get into the medical field in some capacity, because for whatever reason that shits sticks in my head. Special interest I guess? Idk.
A specific chunk of people would for sure move over to Lemmy, and there would be a lot of angry uses, but just because people get angry doesn’t mean they’ll move over. They’ll whine about it but in the end they’ll stay on Reddit.
Personal experience, I tried to move over to Lemmy but when I’m searching for something specific I’ll still look at reddit a lot of the time, just because of the sheer mass of material there is. But I refuse to post on reddit anymore since I don’t want to contribute to it.
I know I’m still giving reddit views, which ultimately adds to their revenue through ads. I’m not happy about that. But if I’m having a computer problem, or want to find out why my peace lily plant is dying, I can pretty much always find the answer on reddit. Lemmy isn’t there yet. (Not even close tbh.)
But for the things that are on Lemmy, the quality of discussion is much higher. 99% of reddit comments on the bigger subs are jokes. Funny ones maybe, but not provocative or though-inducing.
tl;dr a lot of people would talk about migrating but it’d blow over and only a minority would follow through.