I do not think sequels were ever a big idea when this film was made. That huge remote at the start of the film was tossed and forgotten. I was almost sure it had buttons on it to turn off the traps that protect the computer core.Even though it required the "brilliant" decision to both a) give an AI control of nukes and then b) make said AI impossible to unplug in case anything goes wrong or it turns out bad. I was surprised to learn the film was based on a series of books, and that later books involved aliens invading! Where's that film?
Speaking of which, what do they do when core parts break down?