PoS dead? Did you mean to say PoW is dead? Since it's about Bitcoin..
If so, I have to disagree. I am getting more and more convinced of the merits of PoW and Bitcoin itself. My path has taken me from Bitcoin and Litecoin in 2013, to altcoins in 2017, but inevitably back to Bitcoin as I realize that none of the technological upgrades of the alts matter. The only things that matters in a blockchain are decentralization and the security, censorship-resistance and trustless environment it brings. Bitcoin is the only one who has that, and the enormous hashing rate has crossed over to the point where it guarantees a certain level of security that no other chain can offer.
edit: this is coming from someone with 75% position in alts.
They had to put those next to each other on the keyboard. Fixed.
I'm not making a prediction, I don't know that it's even 25% likely. But if it's 10% likely it's trouble.
The resource cost is also a pretty big deal.