I should probably explain what I mean by the "story of the OT."
The story of the original trilogy was the story of how Luke Skywalker became a Jedi Knight and helped defeat an empire. For Lucas to make the OT into part of a six film epic of the tragedy of Anakin Skywalker is unnecessary. Anakin Skywalker can have his own trilogy, and his own story, completely separate from the OT, with a (gasp!) happy ending.