Why would anyone want to convert the Eth chain to a POS only chain? That is counter to growth in this case, as it would create an unbalanced ecosystem, unlike other chains that started as POS. I'm not seeing why there would be any support from the ethereum community for this to happen.
This kind of reminds me of the issue going on with this chain, people worried about the ninja mine that's been around for a long time, and only now is it a huge problem since Sun bought the owner of it.
I hope the Eth community continues to be a pow chain.