I agree with you one hundred percent! It will be a reality in the next decade and all our current encryption will become a joke. It's a good thing blockchains are preparing for this because it could be used to steal crypto and could permanently devastate the industry.
What's scarier to me is that I doubt the government or military will be ready and will be among the first victims. Like you said many states are stealing as many encrypted and non encrypted files as possible. That's why China is working so hard to achieve quantum computing!
First victims? More like the first guilty of using it against us! (government)