Funny you mention David Weber. He has slowed down IMHO. Long waits between the next Honor Harrington book (or any of the spinoff's). Long waits for the Off Armageddon reef series.
Orson Scott Card had a stroke, so it's understandable. But still...I miss his old pace of releasing books. I'm not one of those who mind when an author takes on a co-writer, writes together, and eventually passes the torch. But I don't think OSC is setting himself up for that.
I'm a comfort reader. I love long series where I already know the universe, the characters and it's just a new story. Even though today's Dune books (another series of wait wait wait) or Jack Ryan books are nothing like the original few (even when the original authors were still writing)....I just love reading books in those universes.