it seems that it will be difficult to happen because this altcoin will not die easily and some altcoins will also become very large and have a platform project that is very useful for many people. and if that happens then only the remaining bitcoins will remain so that it will increase the price of bitcoin to more than what happened when the year ended 2017.
The popularity of some altcoins (Ethereum, TRON, NEO for instance) is so great that even if something happens to Bitcoin, they will live with their own life. Additionally, I want to say that BTC will not die.