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?
Most of the altcoins even won't get existed even after three years so we can't jist say as altcoins there are some altcoins can existing for years and some altcoins even didn't get any exchange so choose the altcoin just based on the quality of the project and it may get very worthy in short time.