Quote from: mpufatzis on Today at 01:05:14 PM

Furthermore, to be more specific about what a QC is capable of it is that, a QC could mine all the rest coins in a few minutes, maybe, and break the keys of all the addresses.

You cannot. The difficulty ensures that there is at least an increasing difficulty for mining. Unless you can consistently increase your hashpower AND outpace all the advanced ASICs that there is right now, you'll likely not be able to do so.

QC has not been proven to be able to break RIPEMD160 and SHA256 yet so breaking the keys to all the addresses is a stretch.

Quote from: mpufatzis on Today at 01:05:14 PM

Some people believe that there are more interesting fields for a QC to be used like medical research, industrial secrets, espionage (in general), than just have it for cryptos which it could meant extra time for us to get prepared for what is coming next.

In this forum, I have read many times about quantum resistant wallets / blockchain (whatever could be utilized to protect us). However, I have never heard of computer engineers able to develop a defence system, or any BTC team that would be ready to confront a possible QC threat.

Trust me, when it is time, the mitigation would be quick. For now, it's definitely more than sufficient to defend against attacks if we don't reuse addresses. QC is not a magical machine that is able to break everything.

Quote from: mpufatzis on Today at 01:05:14 PM

Additionally, in case of a QC and a successful Quantum resistant ecosystem, a QC would allow somebody to break the keys of all the owners’ “lost” addresses because they themselves will not be able to change them on time to the new ecosystem field.
The “lost” coins (BTC or crypto) could be used again, contributing to the price.

Please, just imagine the scenario:
1 million or more BTC available in the exchanges, simultaneously!
BTC’s price, and the crypto ecosystem, could collapse instantly by selling in a ridiculous cheap price.
This is the bad scenario.
A good one is, that the new owners could sell them, one by one, for fiat, to get rich, or to finance their QC research.

Do you think that all these could ever be a reality?

How many of the addresses are lost AND their public keys are not revealed yet?