Forcing the UNSC to maintain membership so that it represents about 50% of the world population would be interesting. If you go by the most populated counties you get China, India, US, Indonesia, Pakistan, Brazil, and Nigeria, leaving Bangladesh next.
oops darn that means Russia, UK, and France don’t make the cut. Shame! (Though they could act in concert with other states to get a 50% majority if they could manage it)
not that it would happen but I like the thought