I do not have many friends, but many acquaintances, (Through work, business, whatever...). (Now retired.)
None of my close friends reload. Some shoot, but not nearly as much as I do.
Some acquaintances reload, but as time goes on I can only think of a couple who are still here to do so.
I have friends of friends that reload, but we rarely are in contact.
I have 1 daughter and 5 sons. Eight grand-children.
Am happy to say my son-in-law is now getting set up to reload. (good thing too, as my Grandson is nuts about guns!)
Another son may be thinking about getting the game on for reloading as his son is the same as his cousin. (This grandson would come into the reloading room and "help" starting around 3 years old!)
Another son is in the business of selling guns. (In Wassilla, AK). Guess what? Yeah, he reloads.
So I feel pretty lucky being what I consider above average in passing a tradition and history down to the next generation(s).
As far as to how many shooters reload, your guess is as good as mine. In my opinion. not enough! I hope that this hobby is passed on for many years! Just like hunting and fishing and anything outdoors!!!