I doubt bitcoin will ever disappear from the industry. Even though bitcoin disappears, there are lots of alternative coins in crypto-currency. Bitcoin is the most used bitcoin so it will have a really big factor on the price of alt coins. The coin that will replace bitcoin will surely have the same price as bitcoin in no time.
what if all participate cryptocurrency be unused? if bitcoin becomes dead and missing would be a lot of people have had losses and you know bitcoin like mother of many altcoin. if bitocin die it will make the trust a lot of people to cryptocurrency will come to be dead also