First off, we should NOT be telling anyone to simply not be a Machinist.

Yes, I understand that low numbers of players playing that job would make a statement, but the inverse is true as well. If there are many people playing it, then not only will the knowledge and experience pool grow, but that as well will speak in volumes. An unplayed class/job simply says there's a lack of interest; but numbers of players who can show and prove that the class/job is in need of improvement would make for a better statement.