My issue with appointing Nuno is simply this, would Spurs, Chelsea, Manure, RS, City, Arsenal etc appoint him as their Manager? The answer is a resounding no and if our aim is to be competing with the top teams then we shouldn't be appointing him either. We got Ancelotti no matter how over the hill he is and we should be patient and get another high quality Manager that any top team would appoint.
Appointing someone like Nuno no matter how well or bad he might do is accepting we are a mid table team and can get no better. We can get better and should get better.