I think his attitude is tailored to the expectation levels he manages under. He'd know at Everton there's grater expectations to satisfy and he'd have the better squad to achieve it with.
Overall, I really dont think we should be looking first and foremost for a manager to take us to the next level. It isn't possible now because the better players will likely be sold this summer and an incoming manager would need a few years to create their own vision and style. I cant stress enough how much of a danger we're in here at the moment. There'll be carnage this summer and we'll need a man who can deal with it and remain composed and focused.
I really agree with your last paragraph and trust me the seriousness of our situation isnt lost on me. Many fans will be challenged, there is a generation that has now grown under Moyes, that expects and doesnt know what its like to be a fan during bad times, you and i both know that structurally and fundamentally nothing has changed behind the scenes since the terrible days of the 90s and early 00s. Moyes has papered over the cracks for many years and now we are set for a period of best threading water and worse sucked down to pre Moyes finishes. Its not just about his management style or the football team, he was fundamental to the business model of the club which masked a lot vulnerability - im majoroly concerned, Everton will need its fans more then ever in the coming time, its easy to be fan in good times, but the true test will be what we are facing into.
What concerns me about Martinez as i stated is he comes with a philosphy - that is rigid, if entertaining. He has conviction - that the club will have to buy into - for example hes prepared to take Wigan down without altering that philosophy - if he is our next manager the club need to buy into that and be prepared for the consequences as will fans. I liken the situation to what Paul Lambert did at Villa this year, maybe 5 steps back to take steps forward but it does come with risk, buying in to a certain philosophy you have to be prepared to play hard and fast with the clubs fortunes and take that risk.
Id prob be more conservitive and go for a safe pair hands like Clarke who i mentioned, but if Martinez came in and thats the direction we decided to go id support it - it would concern me - but likely Everton would need every single one of its fans.