Blockchain democracy won't work. But online "direct democracy" voting definitely will work. There are ways to verify all votes are valid, there are ways to algorithmically include the secluded offline grand-mother securely too.
You basically ask people to vote on everything, people don't have to vote if they don't have time or don't care. The algorithm can automatically identify the best representatives of the people among all the people, based on people's voting patterns easily. @adam