Well, yes, because the the actual problem is a blue river. I'm always waiting on tanks to fill. I'm always seeing parties that could fill if only there were one or two more tanks.
Unless, of course, that sort of thing depends on your data center, the time of day you want to raid, the people you normally raid with, your own personal choice of job, etc. etc.
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I mean, "popularity" strikes me as one of the worst metrics to base class/job design around. It's better that a class/job (or role) attract a dedicated following than the mercurial folk who will jump ship as soon as another hotness appears on the scene.