Good articles. I think the PoS∕PoW discussion is next on the list when the scaling issue has been resolved. Hopefully Athereum will have shown that PoS can work by then.
The problem is that closed entropy systems are permissioned ledgers because:
You can define Bitcoin in one sentence:
The purpose of mining is to create a permanent two way peg, decentralized exchange, which thus results in a permissionless system.