To be honest I don't know. There are only eleven --- sorry, twelve! --- months in a year and in order to make something special it has to be, well, special. If I were to make every other month a featured one, I think the novelty value would be lost. Add to that the amount of work that goes into these --- I've been preparing for Metal Month II since August, and before, if you count mentally --- and I just feel everything else I do would suffer as a result.
Naturally, my own preference would be for Prog Month (duh!) but then again, I feature a lot of Prog in my journals anyway, so maybe that wouldn't be necessary. Country Month could be interesting, but who would read that?
You know, there's nothing stopping you doing Psych Month or Folk Month or whatever: I don't have copyright on the idea
(Copyright Trollheart Enterprises MMXIII, all rights reserved. Any copyright infringemnent will be vigorously contested in court) so anyone else is free to do it. Batty did a month themed around the likes of ICP if I recall. There is a lot of work though, and really once you start --- even once you announce it --- you have to see it through unless you want your readers to see you as a flake, so if you were intending to try it might I suggest an exploratory Week first? I had intended to do Metal Week originally but then decided I couldn't cover all I wanted to in one week, so extended it to four. But then, I'm clinically insane, as we all know, and a lost cause...
So the short answer is no, I don't think so. I also want Metal Month to stand out each year, not get subsumed within a plethora of other features like Country, Prog or (God help us) Pop Month....