Everything in business is about supply/demand, and when the SE in '04 were the #1 seller on DVD that year, why should Lucas think there is a huge demand for the OOT? It is just like the money the PT made in the theater, sure there are vocal people that didn't like it, but the movies made ALOT of money, so why should Lucas think that there aren't saga fans who enjoy the 6 movies?
The only way that Lucas will go back to the older fanbase is if the new fanbase dries up. If the toys stop selling, the videogames don't sell as well, the Clone War movie underperforms, the TV show gets low ratings, etc. Lucas will then realize that the real cash cow for the future is the movies, and he may realize the OOT fanbase will always be there, and the 'Saga' fans may be the wishy washy ones.
Only time will tell, cause SW is a train that has never derailed no matter what quality has been put out, and as long it is keeps making money with Lucas's new endeavors, the farther away Lucas will distance himself from the old fanbase and focus on the new.
Edit: To sorta sum up my post, if the '04 DVD's didn't sell well, can we all agree that the OOT would have been remastered for a nice boxset a year or two after that, cause Lucas would have gotten the memo that nobody wants the SE, they want the originals. But the OT is so powerful, the majority of people will 'put up' with the SE just to have them on DVD. I can't tell ya how many of my friends bough the 04 Boxset and said, "Yeah, the SE changes annoy me, but its SW!"