Honestly, I think I'd prefer an idea like this not be implemented, as far as my own preferences go. I feel the present differences in stats are appropriate.
Although I do find it funny that everyone's letting their memories of Final Fantasy XI blind them to the fact that in XIV, Mi'qote are thematically (and in terms of what stat differences already exist) slightly the better mages and Lalafell the better thief-types.
Slightly.