This question is asking for opinions on using Proof-of-Stake as a means of establishing a distributed consensus through the block chain. My opinion is that in a closed system, RAFT is going to be way more efficient. In an open system, POS makes some sense as the "owners" are forming the consensus. You have to make sure that ownership is broad enough and relatively evenly distributed to avoid your distributed system being (effectively) owned by someone who "owns" a majority of the total stake.