There's a LOT of middle ground between the focus of Dark Sun and the kitchen sink that is the Realms. :p
And what I'm saying doesn't widen the focus at all. It just gives the DM some idea of what nasty Dark Sun dangers might be lurking outside the Tablelands.
I'm not suggesting that right...
Two items, Stone of Good Luck and Cloak of Protection are uncommon items, and the Ring of Protection is rare. The rest are going to be harder to find. Yes, they take attunement, but that a choice the player will have to make. Choices are an important part of the game.
Also, if we drop to...
For a small area, though, it has a lot packed into it. I have the older stuff and there's a lot there. Also, I'd love to see the Tablelands expanded in size or at least some space dedicated to ideas for the DM to use if the players leave and go into the Hinterlands.
A large magical catastrophe could change that.
This isn't incompatible at all. The gods have already left Krynn twice! A third time forever would be easily believable.
This can be handled by a minor retcon to add in psionics after the disaster. One of the apocalypses could change the world...
Heh. I really don't know where the novels ultimately took Dragonlance, but I do know that at some point dragons were killing and absorbing the power of other dragons, creating a few uber powerful dragons surviving. At that point all you would need is an apocalyptic event and Dragonlance could...
I'm the opposite of you and @TheSword. I don't really buy adventure books outside of anthologies and Undermountain(love me that Undermountain), so I want the lore in a setting book for me to draw on as I make my own adventures. Lore in adventure paths is lost to me.