Many of us have heard about the Quantum Computer (QC).
Although it has been on an experimental stage yet, it is a matter of time to be built.
In one of his speeches, Antonopoulos said that a full working QC could have been in full function within the next decade.

So, when this happen, a QC could be a risk regarding all cryptocurrencies in the market.

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.

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.

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?
In my opinion, we are not allowed to think otherwise or ignore it.

It reminds me as I am thinking of the QC, the Enigma Engine and “Bombe”, the computer built by Alan Touring, who broke the German code.
Its existence was a top-secret and was finally revealed many decades later, in the ‘70s...