Hack attack on DPoS:
* compromise the private and probably firewalled computers of 51 de-centralized delegates, WITHOUT THEIR KNOWLEDGE. I can't even imagine how you would be able to obtain the IPs of these 51 delegates.
Hack attack on Bitcoin PoW:
* hack discus fish and ghash.io, (both offer web server access). and... done
discus fish and ghash.io probably have much better security than those 51 delegates but that is besides the point. The point is I agree that bitcoin is vulnerable, and that's why I repeatedly have claimed your suggestions would be 1 step forward and 2 steps back in the long term. you are introducing new attack vulnerabilities when we should focus on fixing bitcoins known existing vulnerabilities.
What we need is a much larger and diverse pool of nodes and a much more diverse pool of miners that aren't using cloud mining or non-p2p pools.