Not necessarily, no one knows what will happen when bitcoin is lost, too many possibilities will happen mate.
Could be, eth, bch, btg or else replace bitcoin place. Or just the opposite of the cryptocurrency world lost along with the loss of bitcoin.
But I feel the crypto world will never disappear, maybe only a few people will use bitcoin later on. cryptocurrency is a technology that is being developed by many institutions, so it's unlikely that the whole thing will disappear or be worthless.