I agree with all of that. Which is why you just need a bit of faith. And there's no point making a kneejerk 'Martinez Out' decision now. I mentioned his past because some people appear to be relishing our crap form and cannot wait to put their boot into someone they have clearly never rated, which is ridiculous given his track record.
The idea that there will 'come a time when enough is enough' is interesting, because we're still in 2 cup competitions, not directly in a relegation battle, but are clearly not doing too well. There are a lot of mitigating factors for this - Martinez is going to be hardpressed to magic up a winning run of form when we have so many key players injured/suspended/out of form, doubly so when we have Man City, Liverpool and Chelsea in the next 6 league games.
People are going to have to be realistic and patient, and also look at history and how the EFC board have backed managers A LOT in the past during similar bad runs of form. There were 3 occasions in Moyes tenure where he would probably have been sacked at any other club but wasn't.
Kenwright isn't going to sack Martinez unless things are absolutely dire, like 'in the bottom 3 in April' dire. And yes, that is somewhat scary, if it happens.
I don't think that will happen to us; we'll stablise things and finish about mid-table.