Wow, that's a really interesting concept, I think I can actually see Rarity's parents being a lot like that too.
Also, to add to the discussion, I would love to see more on the parents too, it would all be really interesting, I think it would be neat to see an episode where they show brief backgrounds of each of the Mane 6's parents, as well as explaining why they're not in the picture. As someone mentioned, it could very well be that they are there, but they're just not shown very much. I don't really feel like it's like that though.