As we all know that bitcoin is the king of the crypto universe because it is the first and original cypto currency, and it is undeniably responsible for the invention of blockchain technology, because of the discovery of blockchain technology which is the main reason of the growth of the alternative coins, altcoins are generally defined as bitcoin alternative."
So when we say bitcoin will be gone, it has a very less chance. Since bitcoin is the first and the origin of all other alternative coins. So other coins will not be here if not because of bitcoin.