Btc is just another FIAT currency though have some positive things compare to USD, Euro etc.
First of all its not in the hands of The FED/BiS etc. , so when the petro-dollar system crash.. Alt-coins is left untouched.
Thats the idea anyway. (Lol)
But to be frank.. Even Bitcoin and other digital currency except the global banking industries own digicoin at that time will also crash to zero/being Killed.
Easy as that.
Thats why we have gold and silver LOL

Cheers ... :)