What if it is Luttig, and after the nuclear option he gets confirmed, and turns out to be worse than Souter? Then you'll be thinking Miers would not have been so bad.
By then, Miers will be a hypothetical. Intelligent people do not waste time pondering hypotheticals. How nominee's act after they get to the Court are up to them. It's their integrity and character on the line then. Souter, obviously was disingenuous, or of weak character. That is his fault. It should have been discovered before he was nominated, and that is GHW Bush's fault. That is not always easy to though, if the candidate wants to hide it.