Stine and the kids will get trapped in a real life version of Give Yourself Goosebumps, where one of the monsters that escaped is constantly writing progressively more ridiculous ways to try and kill them, thwarted by them picking the least plausible option for safety, filling it to the brim with CYA references (especially since Stine did so many of them outside of Goosebumps). Boom, done.
That being said, the format they have gone with doesn't really lend itself to a lot of unique sequels, but with it being aimed at kids, I doubt that the filmmakers would mind that so much.