Here's an interview of Inoue talking about all this. The interesting part begins at the ***
I agree he's not quite back were he used to be, but then again he is one of the oldest still in active business. The job is pretty demanding, and most of his contemporaries are only doing one shots these days. Maybe he will never be back were he used to be. His works are still better then a lot of what the newer guys make. I'm still hopeing for a graceful end on this story and his career as a regular mangaka.
Thanks for posting the interview. I had no idea Inoue was in such a position, and I hope the currently monthly release schedule isn't tiring him out too much at the age of 46.
@Monkey King: I figured so from the raws, yes.