If the minifigures website is accurate, there’s still more than half in the wild.
Josh and I have had an eye on the resale market, and I can just about guarantee that the minifig site is NOT accurate – it only reflects “registered” Mr. Golds (i.e. – ones where the finder went online and punched in the code), but a lot of sellers are listing as “unregistered”, which presumably is more attractive to the buyer… so I’m guessing most of what has yet to be “found” really just has yet to be “registered”…