Lucas has absolutely no foresight. He has Luke and Leia making out and makes them brother & sister 3 years later. He could not pull off such a "conspiracy" if his life depended on it.
And now for my conspiracy theory:
I wonder if some posters here are Lucasfilm plants? Some people post ridiculous things like this topic that just make us look bad. A couple posters constantly say, "We've lost, George has won" and try to get us to give up on our efforts.