Even if you say these will be "The  Second generation of Quantum Computers" the fact remains that these will be only a few in numbers at first, It took decades for "Personal Computers" to roll out after the invention of first few generations. It will be same with the Quantum Computers I believe, Just like its mentioned in this thread currently a Below 0 degree temperature is required to run today's "Quantum Computers". So when these 2nd, 3rd or 4th whatever generation it may be, become a reality. Everybody won't have these in their basements... Only a select few will have the opportunity to work with them. What will happen to the "Decentralized" nature of the CryptoCurriences?

I mean if you look at companies like Bitmain, they use their Asics first and mine the S**t out of them, driving up the hash rate, Once they are done they sell their stuff to the public. All I am saying is will we be able to "save" the decentralized nature of Cryptocurrencies. Once these "Super Machines" become a reality?