in my opinion, the alt coin will become a dead coin if btc drops to 10 $, I can't imagine that this will happen because BTC is the king of cryptocurrency, one of the factors for alt coins can be up to now because bitcoin, in my opinion, if btc rises, the average altcoin also rises after the cycle what i saw
It will never happen and just imaginary question. according to Google survey more than 1.3 million users are holding btc and this number was just 1k in 2010. The possible reason to drop btc to this stage os only if Btc Contract code accessed by someone and hack the full code which is impossible. This isbthe reason Btc is Most trusted Crypto coins because of its decentralization.
If it happen and btc drop to 10$ then all Altcoins will crashed like ustc and Luna. no one will be in mood of buying any coin and we would see big sell pressure.