There are already some baking [proposals](https://github.com/cryptoquick/bips/blob/p2qrh/bip-0360.mediawiki) that I've seen so far. I've also seen a very high quality article here in SN that also both addresses the problem and gave more than one good solutions to quantum resistant encryption (I'm not sure whether I can find the SN post)

ch0k1

bitcoin

Will Quantum Computing Break Bitcoin?

Been hearing about this for 20 years now. They keep hyping it every few years and there isn't any practical applications yet and the recent Google "demo" while impressive sound is not practical either. From all that I have read they have a long way to go. 

The other side is the power consumption and cooling requirements are insane. 

If it ever does become practical there will be improvements to address quantum. The same people developing these things have counterparts thinking about defending against them. Computer science is always an arms race. Stay calm. It is far more profitable to hype than be calm and rational. That's why we get so much hyped BS. 