Even for first edition, I really don't see the point (at least personally.) Kingmaker is definitely a path that I enjoyed, but it already has the new game and there are still two paths that were never properly updated to pathfinder and those will be missed. Especially Legacy of Fire...
On the flip side while I'm not ready to change editions, and may never be, I can still understand the desire for their next re-edit to be in the latest edition and not an old format for which support will likely slowly fade out.