The book heavily implies the creature is dead. Would there even be a new cycle? A couple of books drop hints that yes, It might not be as dead as the book itself leads you to believe. Does this great tome need a sequel, though? I don't think so. I doubt the experience will be as satisfying anyway, without the intertwining kids/adults structure.
What I wouldn't mind is a little hint as to how Ben & Bev are doing. We've heard from Mike, and we know Bill & Richie started a band, but what about the other 2 survivors?