No, not really. A "backfire" would require that Democrats win less than they would be expected to win under a fair map, so they'd have to be winning an average of either zero or one seats over the course of the decade. I do not think anyone seriously believes that any district other than NM-02 is holdable for the Republicans long-term unless the state shifts hard right, so there's your answer.
In this case, I think the OP's premise is his apparent belief that Republicans will soon achieve Bush '04-levels of support among Hispanics.
