I it going to be a very powerful computer and will be the god of brute forcing wallets if ever hackers gets their hands to it.
Brute-forcing to crack the private key isn't going to work. You need quantum computers for this, and if the rumour is true then although it may seem impossible to get the private keys for now in the near future this might well become a probability.
I'd highly recommend you both to actually read about quantum computers and what they can achieve.
They are
not magic machines.
There are quantum algorithms which do decrease the search space for specific mathematical problems, yes.
But they can not just easily crack and bruteforce everything.
This is dangerous sciolism being spread by unaware people.