Hehe, we are all so idealistic. In an ideal world, there will be no government, we make or own decisions, and we don't impose our decisions onto others. We won't need to vote, but the better decision makers will generally end up doing better than others.
But this is not an idealistic world. We have it roughly right in australia. Everyone, including some who may not make the best informed decision, get a say. There is nothing wrong with that, because all of these people are advised in one way or another about the new potential leaders and policies, and people like us, who are passionate about doing the right thing, always manage to get ourselves heard by the broader public.
The problem here is not who is allowed to vote, what we need to regulate is the ethics of political campaigns. What we really need is a popular correspondent giving the public a no-bs digest of all political parties, without bias, and let people decide on what they like, as opposed to making a decision from the media with extremist views flying from left, right and center.