It's not about the power of hardware. It is based on the code on blockchain where you have to gain access into it. I think hacking bitcoin will not likely to happen as we know the technology of blockchain you can be traced as it is the use of blockchain, to trace transactions.
You're right, How could be hack that bitcoin private keys if didn't get by the hacker. It is very impossible to hack easily the blockchain. How to predict they super computer the bitcoin private keys if the blockchain is a random numbers and letters. That is impossible, Any kind of super computer never hack bitcoin private key to open it. The only one thing that I know how to hack private is to hack first the computer of the target.