Could there be a Rule of Law Problem at the EU Court of Justice?

The Member States’ current plan of replacing the sitting U.K. Advocate General at the Court of Justice Eleanor Sharpston before the end of her six-year term raises a serious question whether doing so may violate the European Treaties. If yes, this would be a troubling intrusion on the independence of the Court and the constitutional structure of the Union – just when the EU should be setting an example for the Member States (both current and former).