I think it doesn't effect any other cryptocurrency has it is in the top the difference between the bitcoin value and other coin value is also too huge and it won't effect..
Where bitcoin is a boss where boss will be in the top it won't compite with other coins...
the volume of bitcoin is indeed too large and remains above, this is influenced by the volality and confidence of traders to continue to buy bitcoin continuously. But if it's related to price, whatever happens to bitcoin will basically make the movement of the altcoin synergize, if bitcoin experiences bullrun, then the altcoin will be sold only to buy bitcoin that is increasing. altcoin will move again if bitcoin experiences a correction.