Already covered why Vitalik likes proof of stake.  Even though all recursive systems (PoS) are inherently permissioned ledgers and not decentralized networks, he has some crazy, far leftist view that capitalism will cease to exist and everything will be run by authoritarian technocrats (which I'm sure he loves to pretend he will be one).  PoW only works in capitalist systems.  PoS, just like all permissioned ledgers (the US dollar is a federated chain), is ideal for usury based, neo-feudalistic, slave plantations.  

Vitalik slobbering over the idea of being trapped inside a completely vertically integrated, centrally planned, communist regime where capitalism doesn't exist, and all means of production and methods of travel are controlled by the state:

https://www.youtube.com/watch?v=i5VVmTI9F9s&feature=youtu.be&t=168