any major demographic shift would crash our society as we know it,,,imho
so, a day without any whole group (race, income status, immigration status) would have significant negative impact
even a day without 'illegal' immigrants, as that status applies to several different scenarios besides just people 'sneaking' in,,,,
as far as right, there are those who argue they aren't given by the government , in which case, ones citizenship status would not be a condition of one having said rights,,,
If all of the illegals were to leave tomorrow, it would have a effect on the economy, but that would be a short term effect.
Would some restaurants close down.. yep.. and for every one that does, 3 new one will open up. Supply and demand stop for... nothing.
American business has never stopped.. thru wars, recessions, global business changes.. you name it.. American business has been thru it.. and survived.. nicely.
Business owners would adapt to the change ( like any change) and make it work. We have been doing that forever.
It would be nothing more then a short term labor shortage. which by the way, we have gone thru countless times over the last 40 years.