I don't think so. It's true that people would like to prefer Bitcoin than altcoins but that's not means nobody had hodl altcoins at all. So Choosing bitcoin, believe in bitcoin etc those are not only reasons making altcoins down. A lots of Altcoins get down because of cheating & scamming (that's why a major people afraid of hodling altcoins). On the contrary, there are s lots of altcoins still available in market with good position.
Actually, I only believe in Bitcoin because altcoin is only a tool to make money in this market and you will certainly risk if held for too long. Of course, there are still some good altcoins for you to hold in the long term, but you need to be careful because the market is very volatile and it doesn't always make a profit from altcoins. One way or another, you have to have faith in your investment and never trust others.