Quantum computers, some people think that they would be a risk to bitcoin... However, there is something called quantum resistant address is. There is already technology in the works to prevent quantum computers from being able to affect Bitcoin. Cryptocurrency is here to stay whether the haters like it or not.
There will always be corresponding solution to any threat and in the case of quantum computing and assuming that the technology like this has already been in motion then I am sure that we also have ways to stop the said technology from disrupting the cryptographic innovation of Bitcoin. Whenever there is a demand for anything, there will always be a supply for it. In my view, quantum computing for now has become an overrated thing.