This would be treading on very shaky ground. A "Constitutional Convention" could quickly spread to undermining the Constitution in its entirety...the libs nirvana!
Well, the last Constitutional convention we held didn't turn out exactly as planned, so I don't really know how successful we would be in holding another one aimed at stemming the tide of illegals.
I do like the state-by-state technique, but I think it should be coupled with a consistent policy of voting against any and every officeholder who devalues American citizenship, starting with our contemptible, feckless U.S. Senate.