I would probably take a good look at the series and go, it has been a while ride but 22 books (plus 3 mega books) is too much. I would condense the next 6 books into 1 or 2 books, and make the capstone trilogy just one book. Then continue on with new works or prequel stuff etc.
I know it is harsh, and he has had more than enough personal woes, but it is probably the most sensible option. Take the pressure off and enjoy his life. But some closure for the fans - that won't take another 20 years would be great.
I fully respect his ambition and his will power to create his achievements over the past two decades, but another two just seems a bit ridiculous.
