If you have a flash drive full of bitcoins and then suddenly, you lose it or it became unusable, the bitcoins in there will be gone forever. Am I right? So, if that's the issue, is it possibe that we run out of supply of bitcoins? If that were to happen, will bitcoin die along with other coins? Or will it die alone?
I will say everything will be down to zero in terms of bitcoin market capitalism but not in terms of altcoins. I am pretty sure that ETH will take over the first place as its market cap is 100% bigger after the bitcoin market cap.
The thing is, we people relate the crypto world to bitcoin all the time. But its not the case and we have to agree that everything is about the Blockchain Technology!!
The B-T is what makes all this and all the altcoins that are present out there. So nothing will happen to alts only bitcoin will go down to zero. :-)