Bitcoin is proving to be extremely strong, practically "immune to death". If you look at Bitcoin Obituaries, people among the most influential and powerful in the world (let JPMorgan CEO be one example) have been unsuccessfully trying to bring it down. Even Hearn tried to destroy it and, despite all the incredibly negative promotion worldwide, Bitcoin's price went down a little only to (slowly) get back. If not even one of its creators was able to kill it, who will?
Immortal no. There is a death for every currency. Even paypal will 'die' eventually.
And so will bitcoin because it will never be a main asset. Always something used besides gold, fiat etc. But the time for bitcoin to shine.. has not come yet. Which means bitcoin got a lot of decades to live.