Don't kid yourself, Bitcoin development is very much centralized, the users will accept whatever client distributed by Gavin Andressen, just like they will accept the upcoming block size hard fork, without realizing there are better solutions available to solve the problem.
That is not how the discussions work within Github and you are conveniently ignoring the other implementations.
I agree with some of your statements of the weaknesses and limitations of PoW and the inherent costs. What you fail to disclose are all the benefits. You simply are shilling PoS and DPoS without a serious consideration of security. Are you assuming that Satoshi didn't consider mining centralization?
The current system where every user is a network node is not the intended configuration for large scale. That would be like every Usenet user runs their own NNTP server. The design supports letting users just be users. The more burden it is to run a node, the fewer nodes there will be. Those few nodes will be big server farms. The rest will be client nodes that only do transactions and don't generate.
Take for example another solution. Bitshares using DPoS. I was told by several active proponents that it is more secure and decentralized than Bitcoin and PoW and BTSX was a "True" deflationary currency because it would never grow beyond 1,999,883,512 coins which investors mainly purchased in an IPO. One month latter a one developer is able to leverage his time between a competing DAC to influence most of the delegates into a merger to create a capital infusion to help pay for development costs or his salary. So it looks like 2.5 billion will be the new number. I wonder how long that will remain true?
Good luck, raising the 21 million cap within bitcoin sir.