There are plenty of things in existence that took more than 15 tries to get right. It is silly to dismiss something because it has failed the last 15 times.
If wealth taxes are beneficial and a good goal to work towards for a society, then it might be worth it to try for a 16th or even a 17th time until someone figures it out. Human flight took plenty of tries too, but it was something we deemed beneficial, so we figured it out.. eventually.
Anyway, Property taxes are a kind of wealth tax, as are capital gains taxes and inheritance taxes. All three of those are wide spread and well established.