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I think it would be difficult as it would require a consensus from all parties involved but possible. I think we would face a situation similar to the scaling debate with Segwit. In the end people would agree on a change if doing nothing means the death of bitcoin.

That is if doing something can actually save the cryptographic based digital currency at that time.

it is good to see qrl innovating this now. btc and eth will evolve just like every other technology will when quantum computing is common enough.