Will non-legal immigration stop when the country being fled to becomes more of a cesspool when compared to the fled country?

Or is it easier to fix the departed country so it looks better than the one being fled to? Also could expenses be levied to the departed country .. I.e. Mexico being billed to house its fled citizens? Will non-legal immigration stop when the jurisdictions like USA , Canada , or Europe becomes bankrupt? Is a better solution available other then locking them all up? like modernizing Mexico and other countries and making the whole world a great place to live? With no reason to flee?