If bitcoin die I dont think altcoins die. Yes some altcoins for sure die because it deoends ti the bitcoin price but they have altcoins deoends to the dollars price and for sure it will still a live what ever happens in bitcoin. But as of now bitcoin will not die and it will live in the online world in the next few years and bitcoin will become more powerful and popular so the price will continue to increase.
People get it wrong whenever they say that an altcoins will take over Bitcoin. I dont really think thats true. If Bitcoin ends today, it will affect other crypto currencies heavily, and 90% of them all will close down/fall. Bitcoin is the road builder and rules the block chain.