We can see these days that not all people know cryptocurrencies, if they do perhaps they have heard only about bitcoin, but without owning or having the experience of making any transactions.
Maybe altcoins will become popular within 3 years from now?
I still don't understand your question because now there are a lot of altcoin they are dying a lot , which altcoin do you want to mention? In the future, I think the percentage of them living is very low