Mueller is not going to be fired. What is happening right now is that the investigation is being exposed as a highly partisan endeavor. A fake dossier paid for by the Clinton camp, brazen supporters of Hillary on the team, donors to Hillary on the team, the FBI running interference for the Hillary camp, mega-leaks coming out of an investigation that is supposed to be confidential until its conclusion, to touch on just a few points that have undermined the investigation.
Muller has discredited himself in virtually every way possible. He knows it and the best scenario for him is to find a way out while saving what little credibility he has left. He's being allowed to find a way and he's undoubtedly smart enough to pursue it. Mueller is done along with the investigation and Trump will remain President. If necessary, gird your loins in preparation. You are going to get some underlings for the whipping post the same as underlings have become sacrificed in special counsel investigations of the past. Somebody has to go to prison or the investigator looks like a dumbass.
The media will spin all this and continue to hype it as they do keeping the faithful stirred up, in the dark and thinking they're still really bright folks. That's the world we live in right now. But take heart knowing that the first word in the term useful idiot is useful. You may be an idiot that the media can manipulate with ease but by golly you're still useful. There's something to be said for that and you may wear that label with pride.