If BTC dies all crypto market dies..I dont think that another coin can replace it, i mean, i dont speak abot technology and so, of course there is already existing projects which technology is more progressive. BTC is main currency, digital gold, there are no alternatives with such big credit of trust.
Well, maybe this would happen if a real hecatomb occurred in the crypto market and the bitcoin disappeared or died suddenly, which I find difficult to happen. What seems to me most likely is that bitcoin dies of "natural death", that is to say, with the passage of time, more advanced financial technologies emerge that gradually displace bitcoin and make it fall into oblivion or obsolescence, and when it occurs in a gradual way maybe the market has matured enough to learn to live without the presence of bitcoin.