that's not necessarily true if the right protocol were developed it's entirely possible to do without necessarily having a ridiculous power bill behind it, in my opinion the problem more comes about through scalability, it would work at first but very quickly the network would become too powerful to sustain itself I mean how easy is it for any kid with a smartphone to see the words free money and install an app? in truth even Bitcoin couldn't handle this type of Rapid scalability no matter how much we all want it to be able to scale like that.