Superb reasoning. Definitely worth publishing. I would send it to the WSJ op-ed page.
I tried (and won) one for the first civil trials before Judge Gleeson after he was appointed to the bench in 1994. I also saw him work as the lead prosecutor in the trial that resulted in the conviction of John Gotti (which is why he was rewarded with a federal judgeship. Gleeson was a pretty good judge, who treated the lawyers, litigants, and defendants with respect, which is not always the case in the Eastern and Southern Districts of New York.
The Constitution limits the federal judicial power to cases or controversies. When the government initiates and the defendant does not oppose dismissal of a guilty plea, the court loses subject matter jurisdiction because there is no longer a case or controversy to adjudicate. At most, the court would still have jurisdiction to impose sanctions for prior misconduct by an attorney or a party or witness.