Z. H. Darkstar
Explorer
While I realize that lots of people were drawn to Sigil, the Factions, etc., a large part of Planescape's appeal for many people was the ability to travel between the various D&D campaign settings. Even if they plan to produce (or at least open up) Planescape eventually, I think there's some logic to the notion of not doing so until at least a handful of other settings are already out and/or open for use.
This is why I think Planescape/Spelljammer would end up being the swansong season of 5e.
EDIT: Poll update
Dark Sun 28%
Dragonlance 27%
Eberron 24%
Greyhawk 21%
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