The retirement of Ferguson, City's wealth and the to money have created a PL environment where there is no such thing as the top 4 any more. 2 of the old big 4 are guaranteed not to be in the CL next season. Even their old fall back option of just throwing money at it is not working. No team can now guarantee sustained CL football so it makes it more difficult for them to get the world's best world beaters like Bale Suarez Neymar Lewandowski etc. They are going for players like Depay and Sterling for big money, shrewd scouting bringing in players like Mahrez and Payet can easily match and surpass that quality. Leicester and Spurs have shown that a talented side harnessed by a very good manager no longer means 'best of the rest' as Moyes Redknapp Robson and ONeill used to find. It now means CL qualification and even the chance of a title.
So the real question is, whilst this window of PL certainty remains open, do we want to show some ambition and potentially put ourselves in the frame to compete for the title, or do we want to give a manager who is on track for two bottom half finished yet more time? Until a new order is established every year we don't act is a potential title challenge passed up. This year has changed football, nothing is off the table any more. Martinez has to go, we cannot waste this chance.