Quantum computing will kill bitcoin if it goes large scale and becomes reality.

Possibly it will be the end of the cryptocurrency economy. This may be the steps made by banks to combat the rise of decentralization. Though I am only speculating but this is possible given the threats of bitcoin to the banking society. I dont have much to show, I have no evidence but purely assumption. But what if it is true then soon decentralization is out of the picture and banking system will be at the top of the financial foodchain once again.

i suppose it would take time still for the quantum computers to crack, lets assume it will take a year if indeed thats how powerful it can be.
By a year bitcoin dev much have upgraded its encryption already to which quantum can't crack anymore.

is quantum computer designed for cracking?

This coin has to flips
one side is NSA dont want to kill btc , because the can arrest the bad guys & their money stash (if in btc), but before btc the where losing the money or the most of them..

but then again if NSA wants btc dead , it would be controlled and not dead, but then again i still believe that satoshi nakamoto is/was NSA from the very start ,

I don't think quantum computing even exists at this point or will ever exist in the next coming years. I think we're talking 20-25 years in the future at least, from what I know the scientists are having tremendous challenges to resolve before they have such device. In all cases it will first be in the hands of governments which I don't think will be spending their time tracking a bitcoin wallet with a few thousand dollars worth of BTC, they have bigger problems to think of, more than our 10 billion dollars in bitcoin.