@brainbomb
there's never been an economy that has been in the position we're in right now with such a large agricultural sector at such low labor costs, while other employment cost indexes have been continuously rising.
the last large deportation i can think of would actually be the black plague, where there was a HUGE demand for lower class workers.
if we deport mexicans, we'll have such a HUGE demand for low cost laborers, that can't be satisfied. thus employment will fall underneath LR∑S (long run aggregate supply jsyk) leading to a Contraction, coupled with increased cost of living - which on its own would stifle the amount people are able to save, as well as baseline MPS (marginal propensity to save, currently thought to be .1) that investment, consumption would shrink
thus GDP which is (one model used) =G+I+C+N would lessen on all fronts except Gov't expenditures.
we'd have to raise taxes SKY HIGH to keep up, or we'd lower them and stick it out. Whatever the scenario debt would increase, and we'd have permanent damage to small businesses which would be consolidated by incipient monopolies.
so no, deporting that many people does not seem wise. A deportation like that would have to take place over 30-40 years to counteract negative effect. shocking an economy never works.