TL;DR - Quantum computing is great, if you’re the bad guy. For the rest of us, there’s a cost/value tradeoff in defending against quantum computing threats. People will tell us it’s too much hassle to upgrade our encryption, but it can be done with reasonable effort.

And a big point is, it is a technology that we have to develop anyway, since big targets like governments, military or big financial or economic companies would want to defend against anyway.