But in the end it will be about as effective as the claims that Sessions is a bigot; and I also have my doubts that Trump sincerely sees Sessions as a scapegoat for the systematic rot that underlies both the bogus Russia investigation, and allowing the Clinton Crime Family to get off.
The removal of Sessions will set off a chain of events that will hurt Trump severely. The firing of Comey is what set off the appointment of a Special Counsel. Trump made some unfortunate remarks to Lester Holt that appeared to make the firing linked to the ongoing FBI Russia investigation. It made it appear that the firing could be seen as an obstruction of justice. And the DJT Junior meeting with the Russian lawyer added to the fire.
The appointment of Rosenstein may have been Sessions biggest mistake, not the recusal. It is worth remembering that Trump interviewed Mueller for the FBI job.