This kind of reactionary design is very fragile because it relies on state transitions. If you start from scratch with two groups, one of 5, one of 11 which operate independently (for whatever reason), forming separate valid consensuses but are supposed to be on the same network, what happens when they rejoin?

It has been argued that POW is ,in fact, *the only* solution to the byzantine generals problem:

https://gist.github.com/oleganza/8cc921e48f396515c6d6