Talking of more realistic expectations .....
If Utd finished outside the top four again (and completely did for zz as another's years 'humiliation' would surely be too much for him to bear after we learned lat night how utterly embarrassed he is not being in the Champions League), would that be acceptable to you?
To me, it would be part of the process of rebuilding to get back to the promised land. And let's face it, at least two of Arsenal, Chelsea, City, L'pool, 'Spurs and Utd are going to miss out every season going forward. That's just the way it now is at the very top. And only one of those 6 are going to win the league on any given season. Someone has to miss out.
I'm asking as I can foresee a complete meltdown if that happened. And as much as I don't think Utd can afford to miss out again in terms of attracting players and the standing of the club in World football, looking strictly at Mourinho and what he's inherited/ the massive job he has to turn this fully around; it's quite conceivable you could finish outside the top 4 again in year one. But I wouldn't say that's necessarily a bad thing if you you're getting big improvement within that and building for the future.
Utd have fallen that far the past three years, it's going to be a long journey/ process/ insert whatever generic term you like here, and patience is the key if you're to be truly committed to see it through under him and get back to where you crave to be.
Be interested to read peoples views on that possibility.
There are a few factors that come into play. For example if the top 4 have stellar seasons, while i would be annoyed, yes I could find the acceptable (obviously after the initial disappointment). However if we have the same or similar season to last year, i will be very annoyed as last year everyone was ***** except for Leicester and Tottenham.
The league has seen many improvements in both players coming in and managers. You wouldn't have thought 5 years ago we would see Pogba and guardiola caliber people.
That last bit was a a bit off topic, but back to it. My overriding belief however would be that while that line of thinking (rebuilding over 5+ years after a successful period) is something positive, while being something I would say myself and mean it, it is a slippery slope.
Not many clubs come back after falling from the top, and if they do it is after a VERY lengthy time. Talking domestically here, and not slighting any teams or fans with this, but Liverpool have not been at the top for 20+ years, Arsenal 10 years. Other clubs like Blackburn & Newcastle will never go back to the top in my lifetime. If you look abroad, clubs like Inter & AC milan haven't truly recovered their dominance either, the list goes on.
Because of these reasons, as a fan I would find it un-acceptable to fall out of the top 4, it gives you an excuse for why the team was not good enough that season, and gives you false hope at the beginning of the season as they are remembering the team as it was, not how it is.
I agree with you however, Jose has an interesting time ahead of him, and I think that this and the following season will make or break the club. There is only so long investors, sponsorship deals, big name managers and players will come to the club when the club is doing poorly. Can't keep banking on the old days to keep you up.