He didn't frame his last several movies based on "what people would buy". He did it based on how it would show on TV. This is documented. He knew that life on the big screen was limited. Life on the small screen afterwards goes on forever. Plan for the bigger audience... TV. And the reason why he didn't do it with his earlier films, I suppose, was studio influence. Later in his career, he had more power of his own and made a decision of his own.

Max, the THX set you are referring to is called the Faces Edition. That's how we refer to it on this site in case you happen to read the name and wonder what it is. It's a shame you weren't able to get the Faces Edition in widescreen. It is choice. Both in terms of picture and packaging. I own it. I love it.