Aside from obvious things like the immaturity of the various technical components (blockchains, biometric security), I think you’ll have a hard time convincing folks outside small circles of crypto idealists that sampling democracy is desirable. Even if it works at a technical level, most people want to explicitly chose who reps them and makes laws for them. Randomly selecting a sample to vote on a law takes that away, and isn’t a direct digital version of contemporary representative democracies/republics. To channel Neo, the problem is choice.

It seems pretty solid but I'm skeptical that you could ever get regular ppl to be able to use and understand a crypto-system like this.