It not an easy call
I say green
The market will undoubtedly be green. But coins will change positions. Namely, when implementing quantum computing, new coins will replace current coins. Such as Kelvin Blockchain, based on quantum technology. Kelvin Blockchain project itself is flexible to implementing cryptographic algorithms which will make it one of the safest blockchains ever existed with 10+ signature available from the start. This project does not rely on any particular signature algorithm and due to the multi-client use - on some single consensus. In case of any problems, it is possible to quickly locate the threat and prevent it’s distribution throughout the system. Moreover, all the blockchains will be processed in one wallet so that the client could have fast transactions, secure investments and cheap smart contracts as well as a lot of other services at his hand. You can read more information about the project here: https://medium.com/@kelvinchain/the-post-quantum-era-of-blockchain-todays-solutions-for-the-world-of-tomorrow-16bdd970f49a