Altcoins are not dying for sure nor it's dead. Bitcoin has reached new high at $18,000+ before it slowly falls down to $15,000 and yes, it's affecting the altcoins since it's an indication that they're dumping their altcoins for bitcoins.But despite all that, Litecoin and Dogecoin continues to rise.
Yes altcoins are not dying though bitcoin continues to explode. For sure there will be a momentum for altcoins once bitcoin stabilize its value. The price of bitcoin is very high so I think there will be a correction always happen but lets see.