Bitcoin will always be the king of the kingdom no matter how great the new coins is and it will be.
The bitcoin will always be the first choice of every person. It will always be.
The existence of an object or thing must have meaning, then this object or thing will be appreciated.
Now bitcoin is needed in order to buy altcoins. Dollars <-> BTC <-> Altcoin. While this chain is exist bitcoin is in safety. But more and more exchanges will introduce trade to the dollar ... Do you understand the idea? Nothing will be forever