Of course, all that is made possible by our pants-on-head stupid water rights laws.
This might be true, but desalination is not without it's own externalities (not counting energy usage). The primary one I am thinking of is the increase in salinity and heat in the local area killing sea life. These issues may be possible to avoid with limited use of desalination today, but a significant increase in volume may reach a point where things like dilution and cooling by mixing does not have the desired effect.
We'll also need somewhere to put all that salt. It'd be best to stop the largest wastes of the clean water that we have. We have plenty of water for people and food. We just have to stop the wasteful practices of industry and force them to be more efficient and responsible even though it will eat into their profits.
I suspect what we'll actually do is what we always do. Innovate our way into a higher standard of living while simultaneously elevating the poorest people out of poverty and finding novel ways to feed, clothe and house our population.
It's funny how persistent malthusians are in the face of evidence to the contrary.
It’s possible that some kind of technological miracle rescues us, but it seems more likely to me that we follow the pattern of catabolic collapse seen in the Bronze Age, Easter Island, and Europe in the Dark Ages. Civilization may rebound, sure, but humans have a history of overextension followed by decline (as do all animals).
https://www.youtube.com/watch?v=7CXj0AGuh4c
I wouldn't worry about it, and have a wonderful day. =3