We also know that male Miqo'te are rarely seen, but again we don't really know why
Honestly I always thought it was because (and this holds true in XI as well) the Mi'Quote are a largely matriarchal society. Males stayed home while the females went out into the world and negotiated with the other nations. We never got to see the mithra homeland in XI (big mistake, instead of money-grabs like abyssea they could actually expand on content but I digress), so maybe they can explore it here and there's your starting point for the males to appear.
You know, one of the reasons that males traditionally outnumbered females in gaming is because we couldn't see ourselves as the main character. Why? The main character was invariably male. Now with more developers giving a choice (lots of games now have male and female lead char storylines), we are seeing more girl gamers and it's great. Anything that brings more people to the table can only be a good thing.
But, we shouldn't do it at the expense of our boys who might like to play as cat-people so I say add the male mithras. Keep the existing lore and structure of the NPCs because there's nothing wrong with a race where the females are the dominant force, but let the boys come play too.