It is know that bicoin mining it's mostly cetralized in China, Antminers are made in China, but it's not on China's interest to concentrate all the hashing power, that would render Bitcoin value less for the rest of miners / world.

Also Quantum computers are still very far away to be concern of, and the major concern would be that theoretically for a quantum computer it would be very easy to hack all the wallets that hold Bitcoin, ethereum, litecoin... so in these years to come maybe we will see digital coins taking distance of the traditional mining as it is done now, and implementing anti quantum protections.