If Q is not larp he wants people to think martial law is a real possibility. This may be just a threat to the cabal to get them to cave. However threats must be plausible. Martial law would be employed under patriot act against treasonous elements. It would be timed with a media blackout and mass arrests.
The only threat to this plan would be patriot uprising against perceived power grab. Q leaks would pre empty such a response by convincing patriot conspiracy crowd all was in good hands.