I agree that proof-of-stake systems are an interesting and promising development on top of existing cryptocurrency technology. But how does that make Bitcoin "

I agree that proof-of-stake systems are an interesting and promising development on top of existing cryptocurrency technology. But how does that make Bitcoin "completely irresponsible" just because it might not be as good as the best, newest available technology? Today's proof-of-stake systems probably never would have existed without Bitcoin. When proof-of-stake systems become mature then Bitcoin could adopt one, or perhaps if Bitcoin users can't reach agreement on that then maybe a new proof-of-stake based cryptocurrency will gain enough trust to overtake Bitcoin. Either way, it serves the purpose of a relatively mature decentralized store of value until then.