If your nos are correct and if desalination was done at the scale of Israel in US, it would mean it would be able to provide 10% of the irrigation needs via desalination.
This is off course not a big deal in USA and desalination and economics of certain agri crops if reassigned can lead to better outcomes. However i am sure India can do with the level of desalination Israel has (scaled up to its population size) as can other middle Eastern countries. If not today, then may be a decade or 2 in the future. This can enable habitation in many areas in land and water scarce countries.
This is off course not a big deal in USA and desalination and economics of certain agri crops if reassigned can lead to better outcomes. However i am sure India can do with the level of desalination Israel has (scaled up to its population size) as can other middle Eastern countries. If not today, then may be a decade or 2 in the future. This can enable habitation in many areas in land and water scarce countries.