Why do you think good altcoins fail to keep going? It seems there are some that are good and people collectively have put in tens of thousands of hours supporting, but the team decides to give up midway.
i think its because the price of bitcoin that going to go high and altcoin can not get rise and its normal. after the price of bitcoin stable, then its altcoin turn to raise the price following the price of bitcoin so lets we wait for a moment.