In my opinion, that will possible. Not all but there are some altcoins which could always bring profit for you for long hold. Sometime those might be dump unexpectedly but those will have always recover. Thats why those are most investmented top coins. The fact is, when people invest on some random project without knowledge so that those could be on moon & makes them rich overnight! But those things makes their assets dump anyhow, even most of the time.
I know of a project that in 2017 was very famous, it gave enough money to those who started it, but because they did not know how to handle things well they ended up in a fight with their investors and the devs treating their clients badly, this caused their currency to be in 20USD ended in less than 1USD, something that was always thought that they were going to raise it, this is the time and still nothing that rises, this type of projects and coins are for me the ones that have been buried and that will never be able to resurface, other than others currencies if they can continue to rise, but they are currencies that already have another type of growth and reputation, not all currencies will rise in an eventual bullish trend of the altcoins, or season of altcoins.