Not everyone knows that and PoW doesn't need to die - at least not necessarily or soon.

PoW can be sustained for quite some time if the price of the PoW coin rises and rises and rises. The only problem with that is that the price is not depending on the coin itself. And the demand for the coin can't be created by the miners at will.
So it's likely that PoW coins fail when the mining can't cover the costs for the mining and lots of mining hardware / mining power is turned off, leaving an enormous risk for >50% attacks for the network.

I'd rather say that PoS coins have a better chance to survice because of their energy efficient way of sustaining the security of the block chain