Yes, the target is unrealistic to fight at the top standing. Many observed say if MU could be degradation if they don't rebuild their performance can be better. Amorim have the trouble to build the team like he expect because the squad have problem with desire with others. There are some players who want to leave, and some of them still want to stay on MU, but the official want let them go. This is important problem which MU will face because at other side, many club out there won't buy the MU player. The MU player is have the problem with peforma, they are fits, but because they often lose, so if they joined to new club, their poor performance will affect to others players.
Manchester United have good players but they are not good enough to compete for top four or the league title, but are not too worse to fall to relegation zone. Top 6 is possible for Manchester United if they can improve player mentality and create motivation for their players to fight more serioulsy and perform better together.
I think, Manchester United head coach is still trying his best to bring out the talented players from the team so that he will know the players to be using whenever they are playing strong teams, because what they did to Liverpool in their last match make people to respect Manchester united new head coach. If you look at Manchester united current position in the premier league competition table, you will agree with me that Manchester united will not going to end up in top four. I know Manchester united head coach will use this season to organize the players very well, because there are some strong teams that will not allow Manchester united to enter top six no matter the kind of players and strategies their head coach is going to use.