But besides that, the whole house-thing analogy is not a proper one. In legal terms, yes, GL can do whatever he wants with his movie. But using a more common sense-ethical point of view, someone building his house has any right to do whatever he wants, because he will be the only one living there. That is not the case with art that it's intent is to counteract with other people. If we follow the "house" arguement to conclusion, we have to assume that GL made the SW trilogy purely for himself (like a house builder would), and therefore should not release it in theatres either.
Moreover, noone has to make the house in a way other people like, because he alone will pay for his house. On the contrary, a film is a self-funding creation. Artists make art that at least some other people have to like, because if they don't the creator will be broke and owing everybody.
The truth with SW and any other piece of art is that it doesen't affect only it's owner/creator. And if GL would be a little more straightforward to himself, he would see that nobody argues about him changing the movies, the whole issue is about releasing the original versions too. If you build a new house, you don't have to go and wreck your old residence, you can always rent it to someone.
After all, the original versions, and the support of the fans who want them is what brought him into the financial position to re-make them.
In a more artistic point of view: Many artists have created different versions of their masterpieces (Van Gogh's sunflowers, Da Vinci's Maiden of the rokcs and so on and so on...)
No one EVER destroyed or renounced the past versions, because this would be a direct insult primarily to himself, but also to the masterpiece and the peolpe that admired it.
I could understand someone not releasing his art to the public for personal reasons (like GL not releasing the OT in DVD) but denying his creation's existence (like he has so elequently stated) is another thing.
This is called ingratitude towards the people who liked his work and supported it, making him who he is today.