With mass adoption of bitcoin, other cryptocurrencies which compliment bitcoin like litecoin would also see a significant increase in their adoption rate, because they use similar tech but less features and trend. There is absolutely no gaurantee that bitcoin may survive or nah, either it could be worth a lot or nothing, you just don't know. Those are the words of Satoshi itself, the founder of bitcoin
Although I would like to believe that it is highly unlikely to happen, there are many things which could go wrong. There might be many scenarios which might differ from one another like for example, if all the major countries ban bitcoin.. This event is highly unlikely to happen but in a situation in which it does, bitcoin dies. Also, if people start losing interest because price starts going down due to negative publicity and slowly all people stop supporting bitcoin, bitcoin dies. This scenario too seems highly unlikely to happen but if something like this happens, bitcoin can be presumed worthless/dead.