Make as many as possible want to deport themselves by cutting off tehir subsidies and benefits. As someone said, tax money going to Mexico (heavily.) Crack down on the employers of illegals (I'm not just talking heavy fines, but also jail time.)
Build the wall and the smart fence and build up the Border Patrol. (Congress authorized 2,000 new Broder Patrol agents per year for 5 years, but the Bush Administration refuses to fund more than about 200, barely enough to cover losses from attrition. Demand full funding of the Border Patrol.)
Deport the rest on school buses (employing the bus drivers for part of the summer out-of-school season) and hold them pending deportation at closed-up military bases.
A great many of them don't receive benefits or subsidies. Why would they "self deport"?
Crack down on the employers of illegals (I'm not just talking heavy fines, but also jail time.)
As with your prior suggestion, that would require legislative changes to current law, both in substance and in enforcement mechanisms. Where are the votes for that in the Senate?
Deport the rest on school buses (employing the bus drivers for part of the summer out-of-school season) and hold them pending deportation at closed-up military bases.
Uh, so who is going to pay to house/feed/clothe these millions of people who now are going nothing at all productive, while they wait the 5-7 years (optimisticall) for the courts to process 10 million aliens?
Shades of Auschwitz? That's how the MSM would spin it!