I don't think if bitcoin dies the rest of the family will also die because some of the Altcoins have different features, advantages and anonymity implementation than bitcoin. Some coins categorize themselves as currency and some as an asset. So, you see because of that they don't serve the same purpose they both have their ways if you know what I mean. Bitcoin is like the father of the family and you know when the father dies the children will grow they won't die too
