Your analysis isn't really a good one, since Proof of Work consensus through mining, isn't really used anymore by the new coins. It seems you're too focused on

Your analysis isn't really a good one, since Proof of Work consensus through mining, isn't really used anymore by the new coins. It seems you're too focused on a specific decentralized consensus solution, while there are already much better ones out there, e.g. Iota with a tangle, skycoin with a web of trust or Elastos that are immune to 51% attacks.