Good thinking but to implement it all takes a long time especially for developing countries. If the blockchain system is implemented by the government it is good especially corruption is now increasingly widespread.
Should not take long even in the Developing Countries if there are competent leaders. Lying, incompetency, covering up frauds will be pretty much difficult for politicians on open Blockchain.
Won't be too difficult to implement in my opinion. There is nothing difficult in being transparent. Full governance on Blockchains will be achieved with or without the support of traditional Countries. It will be most efficient and unattractive to politickers/politicians.