An interesting framing. I have worked on the problem of demonetization. It has merits. While it is a good direction to push towards, It must be done carefully with attention to detail. It amounts to a task akin to designing and building an engine. It has merits and is worthwhile, but just building without very strong attention to detail wastes all effort in a pile of mish-mashed parts that cannot not function. Replacing the roles that money serves is a complex, high dimensional problem with an enormous amount of non-homogeneous interactions. Don't expect the solution to look anything like a bumper-sticker slogan.