We, as a club, need to learn that brutal 'out the door' approach as a player comes to the end of his cycle with us. The problem is, our scouting team are shit and they probably couldn't identify a decent striker if he banged 60 goals in a season and had every Tom, dick and harry chasing his signature.
Great teams keep their squad competitive and hungry this way. We just give our stars a cushty contract into their thirties and sign bollocks to compete with them.
I'd love nothing more than Sergio to get his mojo back, but we need to start going places and if he's not cutting it by May, we need reinforcements or replacements.
Sounds great in practice, but good luck selling a striker who won't sign a contract past 2020 because he's dedicated to finishing his career in Argentina.
You'd be lucky to get much more than £40m for him, because the selling club knows that he won't sign more than a 3 year deal, and then he'll walk away for free.
Either way, Guardiola is literally the manager who has cut players like that loose more than any other. Deco, Ronaldinho, Eto'o, Henry. He got rid of all of them when they got the wrong side of their peak so he won't hesitate to do the same with Sergio IF necessary.