I have heard people talk about how quantum computing could kill Bitcoin, so would Bitcoin be able to "fork off" into a quantum resistant blockchain in a kind of hard fork when the time comes?
If Quantum computers become a threat to bitcoin then quantum resistant new cryptography standards can be incorporated into the bitcoin protocol as a softfork or a hardfork.
After reading this article i think its very hard to bruteforce bitcoin network for private keys but not impossible. Also there's a company claims that it can make a quantum computer with 1000qbits. However this claim is not confirmed