Has the idea ever been explored or at least addressed in the EU, or anywhere in canon? Why do you think it's such a bad idea? Because it's a fan idea? I think you'd be surprised how many ideas Lucas lifts from fans. The ST has to move the SW/Skywalker story forward somehow. You can only do remnants of the empire, sith, dark jedi, bounty hunters, skywalker offspring, clones, etc, etc, so many times before it gets old. SW needs something crazy outta left field and unexpected with a huge twist to ignite it again.