[TFYS]

Education would probably be the answer. In a true democracy we would need to make sure everyone is well educated. Of course there are a lot of decisions that require very specialized knowledge that can't be taught to everyone, and in such cases it might be necessary to have limited participation or some kind of weighted voting.

[pqtyw]

Unfortunately that seems to be highly subjective and different people have a very different understanding of what "well educated" means.