Of course it's not! The world is changing superfast today. Bitcoin is great, but now it's used just llike an asset. And it will be replaced as the coin #1 by some altcoin that will actually be used like a payment tool.
if other altcoin can be use as payment tool.and so as bitcoin as well.so why need some alts when btc can do the job?BITCOIN WILL LAST FOREVER IN NUMBER 1 spot.thats for sure.btc is designed to be the mother of all coins theres maybe some who will rise,but not as what bitcoin does.im pretty sure of that