SCOTUS found the right rooted in the 14th amendment of the constitution, as a function of Equal Protection; then went on to say that Congress could take away the right, if it wanted to.
-- [Perry] needs to propose a Federal fix grand enough to change the subject and appeal to Conservatives. --
I think there is a rub there, as Perry favors some sort of normalization of those here (essentially, making their presence legal), and a generally more relaxed immigration policy going forward.
I think the Plyler decision is incoherent on the "Federal policy" hypothetical, except when the federal policy is deport; in which case the federal policy would be that the person isn't here to receive the public education in the first place.
I also think the Congressional policy (as expressed in law) and executive administration of policy (loathe to deport; generally welcoming of illegal presence) are in tension.