I think there's something to your idea of recycling stagnant cash. Money sitting in a vault or wallet doesn't serve much of a purpose. I see currency as the grease to the wheel of human civilization. We are in a capitalist economy and innovators need new capital now in order to improve the world.
So money that YOU YOURSELF AND NO ONE ELSE earned should have less value if you proved having discipline and not use it? Promoting compulsive behavior is certainly pretty good, especially considering Darwinism has good evidence. People shouldn't be stimulated to buy, they should be stimulated to provide for their needs. The Keynes scheme pretty much stimulates careless buying and leaves little for survival needs.
But hey, if you think stagnant money is so damaging, more power to you,
If only people like Keynes stopped working so hard to defend their ideology and sometimes would use that brain power to contemplate opposing ideologies. What are the odds something you thought of when you were 17 are all proven facts 40years later?