I think this is just a war between rich people. I have read ETH's PoS article briefly, the minimum bet amount is 125 ETH, and this is a game not for the poor.
Pos is really a new solution for the world to reduce electricity consumption. PoS is really effective and it will soon cause PoW to be forgotten because of its utility.
The nodes are bet a lot of money will solve and pack blocks faster and interest rates will also be very stable. It is very suitable for the holders.