[C Of K]

I wouldn't agree that Luke ever brought the force back into balance, even in the EU. Ever since he began training jedi, some have been falling to the dark side.

Although I'm not familiar with recent events, I do know that Jacen is currently considered a sith lord. If anything, I'd say that Luke inadvertently aided the disruption of the harmony Anakin restored, rather than balancing things by allowing jedi to have a personal life.

I think the main reason jedi powers were diminished was because they were trying to battle the dark side while serving Palpatine. You can't battle something, and serve it at the same time, even indirectly. The jedi were pawns in Palpatine's plans, but they were still used to further his dark ends, which was undeniably the destruction of the jedi, and reconstruction of government.

They played a major role in helping him achieve that.