It worked for FFXI though:
http://wiki.ffxiclopedia.org/wiki/White_Mage
http://wiki.ffxiclopedia.org/wiki/Black_Mage
http://wiki.ffxiclopedia.org/wiki/Red_Mage
http://wiki.ffxiclopedia.org/wiki/Blue_Mage

These designs have pretty much been their staple appearance throughout the series, Blue Mage having different designs since they're different in each game but generally the same concept. The names of FFXIV may make sense to the west, but they're generic and tasteless in the original version which is why the naming was proposed in the first place, especially because throughout the game's history everything is linked to certain jobs, like Dual Cast was the main trait/spell/ability of a Red Mage.

That was what the problem with FFXIV, instead of having defined classes, we were all basically freelancers who use different weapons.

Also, Dark Magic:
http://wiki.ffxiclopedia.org/wiki/Dark_Knight

It's not on the same level as Black Magic, but it is their unique spell line. That's why I say it's nicer to know the lore and history of things so it would make sense, because outside of FF a lot of stuff doesn't make sense, just like to non star wars fans, the only thing people know are: "Luke, I am your father." As it's heavily referenced and parodied throughout all time.