5 people with 3000 reputation are required to close a question. In perusing this question again, wetcircuit makes a good point; 5 people can close a question where many more than that have positively engaged the question (through views, comments, answers, etc). I would argue that Worldbuilding is uniquely opinion-based among the SE sites making its question closure criteria much murkier.
Possible ways to correct this would be to make 8 voters required to close a question; make 5 + (# of answers) voters required to close a question; make the reputation required to cast a close vote = 3000 + (# of views); etc.
This is, of course, a software engineering problem. As far as I can tell, all SE sites have the same voting and closing requirements, although reputation required to cast a close vote varies with the size of the site (I only need 500 rep to cast close votes on Earth Science.SE).
Is it possible for Worldbuilding, separate from other SE sites, to change its requirements for closing a question? I would like to know if this change can be done by modifying the configuration of the existing site. I assume this change is not worth the developer time to implement from Stack Exchange's standpoint.
Note: this question does not ask should we change our closing requirements. Let us save that for another question after we have determined whether it is even possible