Well, Spelljammer, Ravenloft and Planescape has pretty much been done as much as you'd want to do them.
From FR, I'd take Mythals. Mythals are perfect for showing a very high-magic city, or for introducing quirky magical affects into terrain. Very good for both making the "high magic" feel of the feywild come alive, or to explain why certain rooms in the dungeon have certain magical terrain effects.
I'd use Birthright as the inspiration for mixing domain rulership, places of power, and some mass combat. I know not everyone wants to bother with that in every campaign, but it would be nice for those of us who want to play a different kind of game in the paragon or epic tier as a break from 30 levels of dungeon crawling. A single book would be good enough for me, similar to 3.5's "Power of Faerun" but not setting specific and more like Birthright.
Similarly if they were ever to do Dragonlance, I'd frame the rules set to be about riding dragons and rules on how to conduct a world-shaking war scenerio like the old 1e Battlesystem rules. Then I'd do a dragonlance-specific Adventure Path scenerio, either updating the old modules again, or running a new war scenerio. Another option is to update Dragonlance as a board game, similar to Castle Ravenloft (or Risk for that matter).
Dark Sun stands apart so much, I don't think I'd take much of anything from it for a Points of Light setting.
I would certainly encourage plundering anything and everything from Greyhawk, especially since so many of the classic dungeons and demon lords have already made their appearance.
Since we have Dragonborn, an updated Council of Wyrms sourcebook could be interesting, with rules on playing dragon wyrmlings, or Dragonborn seeking the transformation into a full dragon.
From FR, I'd take Mythals. Mythals are perfect for showing a very high-magic city, or for introducing quirky magical affects into terrain. Very good for both making the "high magic" feel of the feywild come alive, or to explain why certain rooms in the dungeon have certain magical terrain effects.
I'd use Birthright as the inspiration for mixing domain rulership, places of power, and some mass combat. I know not everyone wants to bother with that in every campaign, but it would be nice for those of us who want to play a different kind of game in the paragon or epic tier as a break from 30 levels of dungeon crawling. A single book would be good enough for me, similar to 3.5's "Power of Faerun" but not setting specific and more like Birthright.
Similarly if they were ever to do Dragonlance, I'd frame the rules set to be about riding dragons and rules on how to conduct a world-shaking war scenerio like the old 1e Battlesystem rules. Then I'd do a dragonlance-specific Adventure Path scenerio, either updating the old modules again, or running a new war scenerio. Another option is to update Dragonlance as a board game, similar to Castle Ravenloft (or Risk for that matter).
Dark Sun stands apart so much, I don't think I'd take much of anything from it for a Points of Light setting.
I would certainly encourage plundering anything and everything from Greyhawk, especially since so many of the classic dungeons and demon lords have already made their appearance.
Since we have Dragonborn, an updated Council of Wyrms sourcebook could be interesting, with rules on playing dragon wyrmlings, or Dragonborn seeking the transformation into a full dragon.