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?
Altcoin never becomes popular if the cryptocurrency market does not recover in the future I think. Now the price of this market had downtrend and not any sign of recovering. Therefore, I think we will wait for the surprise in the next year about the cryptos market and specifically altcoins.