Even if Cunicula has other plans, all other things being equal, people do not choose a medium of exchange which they themselves would be prevented from using the way they want. If he wants to implement features that screw people over, as long as it is distinguishable from the legitimate Bitcoin (and doesn't have sufficient other advantages, such as liquidity or transaction costs), it would not be able to replace Bitcoin. Some masochists or luddites might use it but that's about it.
My alt-chain scheme is detailed here:
https://en.bitcoin.it/wiki/Proof_of_Stake If you read it, I think you'll find that it is not a Keynesian scheme at all. If you think otherwise, please let me know why.
My hope is simply to reduce effective transaction fees to near zero for users that maintain active nodes. No inflation tax. Negligible transaction fees. Blockchain secure against 99.999% PoW attack. Many active nodes. Limited losses in the event of private key theft. Those are my hopes. I don't think bitcoin can give us these things. If I did, I would not have bothered to make a new plan.
I don't work for a central bank. That is not my job. I'll let them worry about Keynesian stimulus. I could really care less. I'm just letting you know how I think central banks would regulate the bitcoin system.
Central bank intervention will only happen if cryptocurrency grows sufficiently to compete with national currency systems. If that is your goal, then you should have some sort of plan. Good luck.
I am more concerned about cryptocurrency growing to effectively compete with PayPal, Western Union, Visa, and Mastercard. I think the developers may not believe that bitcoin is capable of doing this.
http://www.reddit.com/r/Bitcoin/comments/13jj0d/in_favor_of_not_increasing_the_block_size/←This worries me. I think they are at least partly hamstrung by an absurd attachment to PoW.