California is building desalination plants, for example [1]. However, these are expensive to construct and energy-intensive.
It's definitely worth the expense to ensure that people will have access to water, even in a future with intensifying droughts.
But is it worth it to ensure that people's lawns have access to water? Probably not. Especially when there are plenty of landscaping options that have much lower water requirements than a lawn.
A "growth mindset" generally refers to growing the amount of economic value produced - not the amount of resources consumed. Often, such growth can come as a result of technological improvements that increase efficiency. For example, more fuel-efficient aircraft allow airlines to fly more passenger-miles with reduced fuel consumption. Water conservation technologies - including some things, like xeriscaping, that you might not immediately recognize as technologies - are in the same category.
Desalination is exceptionally expensive compared to just waiting to have water fall from the sky.
You can do it in extremely arid climates, for example to provide water to cities, but it makes no economic sense when you already have huge amounts of free water that you waste on inefficient irrigation techniques.
Those three premises are still insuficient to warant desalination.
"Shortage" means little, what we have is a restricted supply curve, that can still meet demand at a higher price. And if that price is insuficient to pay for desalination then it won't happen: when you build your desalination plant and try to sell water at production costs, you won't find any takers. They'll tell you yes, we have a shortage, water prices have exploded by 100%, 2 cents instead of 1 cent, but they certainly won't pay you 10c for desalination.
It's definitely worth the expense to ensure that people will have access to water, even in a future with intensifying droughts.
But is it worth it to ensure that people's lawns have access to water? Probably not. Especially when there are plenty of landscaping options that have much lower water requirements than a lawn.
A "growth mindset" generally refers to growing the amount of economic value produced - not the amount of resources consumed. Often, such growth can come as a result of technological improvements that increase efficiency. For example, more fuel-efficient aircraft allow airlines to fly more passenger-miles with reduced fuel consumption. Water conservation technologies - including some things, like xeriscaping, that you might not immediately recognize as technologies - are in the same category.
[1] https://en.wikipedia.org/wiki/Claude_%22Bud%22_Lewis_Carlsba...