Sure it will!
Your friend must first decide what kind of setting and campaing he wants, Midnight is more for dark fantasy with hard and grim and gritty on the side, Dawnforge is for high fantasy, as Morningstar is, Scarred Lands I leave to Nightfall, the one and only Scarred Lands guy around.
Ed's work is good and I am really looking at it, but more to modules than settings, so better have it ready for an adventure somewhere in a world done.
Iron Kingdoms has one of the best monster books around, it is promising.
There are many many good settings, I would just avoid the Realms, there are so many things doen fro it that he can just be overwhelmed by the (That i not what the book says" thing.
Else, he could make a homebrew on the develop as needed type.