The fact that he's getting FIVE pages a day done instead of 2 tells me he's IMPROVING--it was EASIER to write this script this time out. To think that forcing yourself to write denotes a lack of passion reveals a total ignorance about the craft of writing. you think writers sit at their desk and orgasm out a chapter a day like it's nothing? It's hard, VERY hard work, to keep plugging along when inspiration isn't striking as fast as you want it to. It's why a lot of writers become alcoholics. It doesn't mean they don't WANT to write the book anymore, just that it's gotten HARDER.
To point to this article--which is pretty lazy writing, itself, couldn't have taken more than 10 minutes, being as most of the quotes come from the "Making of" book, as some sort of proof that he doesnt' care anymore, is silly, straight up. You're just trying as hard as you can to see what you want to see, that's all.