Your point about backups is very important but it makes me wonder how long before 50% of a currency is simply gone. I'm sure all users lose a little here and there. I know I have wallets with under $1 worth that I'll eventually forget about. Not to mention the huge mistakes that wipe out thousands of dollars worth. You have to think with this rate of attrition, eventually 50% of bitcoin will be destroyed.
I feel bad for those guys that had bitcoin 7 years ago and lost it.
Same with Dogecoin. Not that it's on the same scale but I remember thousands and thousands being passed around. I remember faucets would give out 10 free coins every couple minutes. I personally had a ton. Sent some to a fund a nascar and the rest just kind of vanished. Trapped in an unknown wallet somewhere. I would probably have about $1000 worth today.
People who die and dont tell anyone the passwords