"Then, you must cut down the mightiest tree in the forest. With..... a herring!" And the question still makes little sense (beyond being rhetorical and a nice way to kill a few minutes) without establishing measurable success criteria. Arbitrary criteria take an arbitrary amount of time of time to fulfill.
I certainly agree that if one of Gardy or Anderson goes, the other will too. And, I'd be good with Dougie at the helm. Then the question becomes: who is the pitching coach?
Gleeman can probably point you in the right direction. http://hardballtalk.nbcsports.com/2013/07/10/is-ron-gardenhire-the-rare-manager-who-wont-get-fired-after-three-straight-90-loss-seasons/