Bitcoins value does indeed affect the price of all altcoins since BTC/AltCoin trading pairs are the most commonly used and is usually the standard go to exchange pair on all cryptocurrency exchanges. So can Altcoin break all the relationship from bitcoin and run as a independent currency.
almost all altcoin in major exchange pairing with BTC.
so when btc drop .pakti altcoin also impact with its own price. even coin like ETH which can be spelled have extraordinary concept still affected of bitcoin price. maybe if there is coin which have a lot feature and platform own can make it happen.