All those Ethereum fanboys gonna get rekt when they realize the fiat value of their precious token was in the mining and not in the utility. The utility will still be there when it goes to POS but the price won't.
If CBs are smart and cunning enough they'll bid up Eth after it moves to PoS. "See Bitcoin? It all fine and safe, just do it. Doi it! Do it! Doooo iiiiiit! Think of the environment and stuff."
Hope CBs prove to be to disorganized and distracted or this could be a very dangerous attack.
They could have more urgent stuff on their hands. Or stuff that is perceived to be more urgent, which is basically the same.