Altcoins are dying and some will be dead. Bitcoin murdered them and now I want to murder my self.
There's no need to worry my friend
Alts would not die because i can say that in the TOP 100, most of the coins have far more better use case than Bitcoin.
Most of the coins has a Blockchain, Can Sent/Receive, Faster Transaction Time. Bitcoin has all the following too except slower Block time. Bitcoin only serves for payment purpose and it is the "Currency" in the Cryptocurrency Scene.
Without Alts, Bitcoin wouldn't perform much