The creative liberties Dauberman took while writing the script are backed by solid reasoning, so even if you hated the ending, remember that the guy did his best to make it enjoyable.
IT: Chapter Two won’t have spin-offs or other supplemental stories, so you can lay those hopes to rest.
It has been a (mostly) fun ride, but it’s time to send the red balloons away and leave Derry for good.
Those who have seen the film and read the book know that the ending is definitive.