-PJ
The Judiciary Act does not amend the Constitution.
Article III, Section 1: “The judicial power of the United States, shall be vested in one Supreme Court, and in such inferior courts as the Congress may from time to time ordain and establish. The judges, both of the supreme and inferior courts, shall hold their offices during good behaviour, and shall, at stated times, receive for their services, a compensation, which shall not be diminished during their continuance in office.”
Since the beginnng of the republic “good behavior” has meant not being convicted of a felony. Attempts to remove judges for their rulings have failed.
Opportunity here. Suppose a court is closed (or realigned) and the Supreme Court rules that the inferior court cannot be closed. Then the basis for impeachment of several Supreme Court justices is established. Whether Congress can get enough votes to remove them is another matter. But Congress can continue with the realignment and let the Supreme Court send its army to enforce its edict. They don't have an army? Oh, well.