I sincerely believe that technology is not created to squash another, nor destroy it. Yes, i am not discounting the fact that quantum computing might break bitcoin's security but i doubt it will be intended to do so. Besides, there's a lot of intelligence poured unto the security dynamics of bitcoin that it was able to convince tech experts that it is nearly hack proof. The cryptographic keys it utilizes are not really of a simple matter otherwise, it would have not survived this much time. People are crazy smart and greedy, there were certainly a lot of attempts to decrypt bitcoin wallets and even attack on the blockchain was surely tried but none succeeded. I'm sure even a quantum computer could not help as the bitcoin core continues to develop and address vulnerabilities such as what you have noted.