From a recent interview with Doug Casey (see his website here):

International Man: The World Economic Forum (WEF) has promoted 15-minute cities. Why are they interested in this topic?

Doug Casey: In the past, the United Nations provided the premier forum for governments to get together and palaver about how to restructure the world. But the UN—fortunately—is fading into obscurity. It’s now really no more than an expensive club for mid-level government officials to vacation in New York while playing big shot and connecting with other ambitious bureaucrats.

The World Economic Forum is for the real power people.

The WEF, however, needs a reason for existing. These people are into power and money. They naturally like to socialize with each other, scratching each other’s backs and seeing themselves as masters of the universe. Now that they’ve gotten to know each other at the WEF and have clearly taken the reigns over at least the Western world, they’re no longer there just to socialize. They have lots of big plans for the plebs.

The concept of the 15-minute city is one of the many prongs of attack that they’ve launched to essentially take over the world, as outrageous as that sounds.