Fortunately the cosmos we have outlined thus far is sufficiently diverse to include both planetary romance locales and more avant garde possibilities. To tie this sliver of the conversation back into the larger issue of campaign setting diversity, one option between the extremes of too few or too many is to create a single campaign world capable of supporting a variety of thematic tastes and campaign styles.
Yeah, you want a lot of flavor choices when you go to the ice cream shop, even though vanilla is the best selling one.
To the OP, I have no idea what WOTC is doing. But I'm sure the manangement meetings are like a Dilbert strip. Something about refocusing on core competencies to leverage into new markets...in the clouds.