I doubt it will disappear, Bitcoin is on its tenth year and we have a majority of responsible users who knows how to take care of their wallet, and newbies are not lacked tutorials on how to protect their coins and their private key, there are so many articles about it online and so many youtube videos as well.
But many newbies too that doesn't care of the protection of their wallets, they are lazy to look for those materials and resources that they might interested with and increase their knowledge of protecting their wallets.
The number of lost bitcoins forever might increase in due time but it does not mean that every bitcoin will be gone in the circulation.