In what situation will bit coin die ?

I never said about the price.
But the Decentralize Concept never gone.
There will be up and down.
Nobody can predict that but Rest assure that Nobody can kill the concept of decentralize Currency.
That's My point.
Price is different topic.

With the google supercomputer !

Basically, if they really succeeded in creating a processor that works in a quantum way and they decide to mine bitcoin (or some blockchain that works with POW) they could shut down bitcoin.

From what I read, It took only 3 minutes and 20 seconds for Google's processor to complete an extremely complex operation, where the most advanced computer of today would have taken ... 10,000 years.

Knowing that the complexity of mining increases over time
complexity = time
they managed to do the opposite
complexity ≠ time
So they could mine bitcoin at breakneck speed (51% attack?)

By the way if what they say is true they succeeded in solving a millennial problem namely P = NP or P ≠ NP

quantum computing

new technology i guess, better store of value, less power consuming, better security etc
it will happen soon, since new tech is changing quickly this day.