As my good old great Auntie always told me, there are always many ways to skin that cat!
Denying jobs, benefits, doing workplace round-ups, mandatory reporting of those arrested and in jails and prisons, school records, community health centers, "driving infraction" mandatory detainments, are but a few legal steps the people can get behind!
Illegals used to return home when their job sources dried up - not now, they get signed up for all manner of government subsidies and even getting business permits and Small Business loans to start businesses!
Don’t hold your breath that there aren’t many different arrows in that quiver!
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I agree with you on practical methods of self-deport. However, the deportation game will be won or lost on citizenship status and whether or not the deportees will have legal protection under the constitution to resist deportation.
http://www.blimmigration.com/Deportation-And-Removal-Defense/15-Common-Defenses-To-Deportation.shtml
Please see defense of deportation as described below...you will understand the longer we kick down the road...the worse the chances of deportation become...
http://www.miracoalition.org/en/enforcement/roknav-resources-deportation/211-deportation-defenses
The current lawless state will require resolve to fix and will most likely finish the career of anyone willing to try. One more reason to get a non-politician to do it.