[And why would that be “better”?]
1. It just accepts and improves the status quo (which is quite satisfactory in my view) without any far reaching changes because it is Mexican-nationals-only thing and 1/3 of able bodied Mexicans is already here).
2. It does not force Mexicans down the road to the citizenship unless those that explicitly want it.
3. It is way-way-way less disruptive than either proposed reform or forced deportation of 12 mln (armed) people or having 12 mln illegals in the country.
Isn’t it funny how they “know” how many illegals are here.
For all we know, it’s 5M or 2M. If they can determine a number, they can deport them.
But that's what you are suggesting when you say "Enforce deportation of remaining illegals." because very few illegals will be inclined to sign on to any legalization proposal. That's because they won't be able to work because no one will hire them unless they have the advantage of paying them off the books and at sub-minimum wage.
And why is it “less disruptive” to have a millions of second-class citizens (temporary workers) who will certainly continue to vote illegally and be agitating for their “rights”?