Ok i'll answer in parts to this to make it clearer to read.
1. Difference between everton and wigan? Good attacking play? Poor defence? Not winning games? Dropping down the league year on year? Sounds pretty similar to me considering it is the same manager and same tactics.
2. As for getting shot? We are 15th in the league mate in April. Not too long ago it was what a manager from our chairman. If they follow the same belief that you have in the manager (or few others on here) then say he wins the cup, but we find ourselves 15th next season at the same point, except the bottom 3 aren't as bad as they are this year and can actually catch us? There is plenty of credible ground, cup or not, that would suggest that martinez may not get sacked at all.
3. True, we haven't sold star players before, but none of them have scored 25 goals in a season before, which is a huge commodity in football to sign. Plus he has announced in march he wants to leave, so he will be gone. The club might be bigger than one player here and there mate, but those 25 goals this year....they are kinda a rare commodity to us to have, seeings though he is our best striker since 1993 for scoring in a season! So for all the record keepers out there, that is 23 years since we had a goal scorer anywhere near this level in the league, so yeah, not so easy to replace that is it?
4. and finally, it is just incredible that you constantly ignore the comparisons to Wigan even now. The records are so similar, with the same manager, the same tactics, the same league positions, the same average of wins, and the same dropping down the league happening. Look it up, they are similar, to think otherwise is just literally turning a blind eye to what is going on.
but giving martinez time here to send us further down is not a whole season mate. Newcastle going down this year are because of the first 4 month form, completely destroyed them. same as villa, only winning 2 games, kinda killed them off before they got going. All it would take is a half season of 'its the europa league's / euros / fans / anyone but the manager / bad luck' and we could really be struggling down there to pick results up, martinez or no martinez.
And for all the managers suggested, Emery/Koeman/Biesla/Mourhinio, none of them would come to us if we were struggling in the league yet again, take the blue tinted glasses off and you get a essentially a team looking like they are going down to every other fan in the country. 11th - 14th (could be 16th after this weeks games) and potentially keep losing and dropping points and norwich can catch us.
(oh and conveniently forgetting palace havent won a game this year until the weekend, double it and they move above us n the league, 1 promoted team above us, one level on points, west brom and swansea who were in relegation battles not long ago above us, how many more warning signs do fans need that this just isnt good enough? )