Altcoin price pin to Btc price, so if BTC is falling it could affect other crypto prices.
Nor of the altcoin can stand on there own and the only ways some of them gain is an inflow of funds from Bitcoin to them. Time is coming and it might not be far from now that most of the coins we have now may not be able to grow as people and invest will not have any reasons to flip Bitcoin for them.
The greed level for bitcoin is being satisfied and we might see correction that could cause a stable price within 10k-14k for some weeks, maybe months. At such times after a lot of profit had been made, some buy back for bitcoin and money flow into altcoin is predicted. The side way prediction is working. For a level of confidence one might engage different medium for information.