And based upon the current Texas Supreme Court attitude about the separation of powers issue, I do not expect that they will intervene in this Senate enforcement issue. That will leave the RATS out in the cold. I know of no issue that the RATS can raise in the federal courts since there has been no actual redistricting done yet in this session.
They did file one suit in federal court in Laredo, claiming that Dewhurst needed DOJ approval before dropping the 2/3rds rule.
That's a remarkably silly claim, but it's all that they have.