As I see the situation with quantum calculations, the main concerns are:

1)  **P2PK** (Pay-to-PubKey) early Satoshi addresses with much BTC

2) REUSED addresses with some BTC amount (which have already exposed their public key

2) Mempool transactions (with visible public keys)

As for the First, a consensus or a Fork Or something like that is needed to block transactions from those addresses

As for the Second, mass education for BTC holders is needed to move BTC from reused addresses to New ones.

As for the Third, I don't know.. Does anybody know a solution?