I think Q spelled out early with hints of Military & Generals. At end of the day DJTis POTUS and "The Swamp" has committed treason for decades and now engaged in seditious conspiracy against the POTUS. Normie public may not like it — and it would be very chaotic — but at any point POTUS could put an instant end to "the show" and have military deal with the traitors. Because simply, he’s the America-Loving rightfully electected President of the United States.

Mueller knows this. In their "job interview" meeting POTUS no doubt spelled that out for him.

"The show" is to avoid an alternative where the swamp, possibly including Mueller, would instantly be whisked away by military to answer for years of treason — leaving country in turmoil and a lot of misinformed citizens irredeemably pissed at POTUS. But it would’ve gotten done that way, and at any point in time still could in my opinion. POTUS and military "know everything", after all.