Maybe, I'll disappoint you :-) we can't be in charge of other blockchains, they have their own developers, and only they can decide how to solve the problem of quantum threat.
What can we do? - We can offer the safest and the most anonymous post-quantum DapCash blockchain. As for other blockchains. What can they do? - They can implement quantum-resistant signatures, for example. But it is not always possible because of the architecture and source code of most currently existing blockchains.