Long-term holding may risk the coin's death. The coin becomes dead coin in the hand, and there must be a lowest price in the heart to reduce losses.
I am afraid I can't agree with you. Most of altcoins are really likely do die in the future, but actually it doesn't concern mainstream currencies. If you buy shit coins or other altcoins that you are not sure about, just follow them all the time, follow all news and crypto market in general and if you see that bitcoin starts changing its movement, get rid of them immediately as they can really become dead.