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That's a great idea, but hard for the city of Las Vegas to implement. Clark County doesn't have any ability to build a city not in a desert either. The state of Nevada doesn't have much of anywhere to put a non-desert city either.

Very few municipalities are willing to deny new residents, either. It wouldn't be anywhere on my list of viable places to live, but population growth in the Las Vegas metro area has been consistently large since 1910 until recently (only 10% growth from 2010 to 2020). The municipalities should likely invest in livability and comfort where possible.