It not only has been expanded far beyond its legal limits, it was a ridiculous decision in the first place.
Very so. More reading on Wong Ark and immigration issues including birthright.
"Testimony of Dr. John C. Eastman, Professor of Law, Chapman University School of Law, Director, The Claremont Institute Center for Constitutional Jurisprudence, Oversight Hearing on “Dual Citizenship, Birthright Citizenship, and the Meaning of Sovereignty” - U.S. House of Representatives, Committee on the Judiciary, Subcommittee on Immigration, Border Security and Claims "
"Born in the U.S.A.? Rethinking Birthright Citizenship in the Wake of 9/11 "
http://lawreview.richmond.edu/?p=469
and here
http://judiciary.house.gov/media/pdfs/eastman092905.pdf
"...But the effort to read Wong Kim Ark more broadly than that, as interpreting the Citizenship Clause to confer birthright citizenship on the children of those not subject to the full and sovereign (as opposed to territorial) jurisdiction of the United States, not only ignores the text, history, and theory of the Citizenship Clause, but it permits the Court to intrude upon a plenary power assigned to Congress itself. "