Democracy is nothing about facts or opinions.
You are the one impacting democracy by saying we cannot survive if we keep current democratic rules.
You can have the best argument for improving society by limiting who is allowed to vote, what things you're allowed to vote on, and what facts you are allowed to talk about. It can even be a true argument that would make everyone better off. But if it's less democracy, then it's anti-democratic. If you care about minorities and people generally, that's good, if you care about democracy, that's bad.
The only way you can lose a democracy is by voting to stop voting, or voting to stop other people from voting.
The intelligence of the population has nothing to do with it.