Surely, United management also considers how their performance is at the beginning of the season. But before that, we try to wait for how United performs in the summer transfer market. Amorim certainly hopes that his target for several players will be realized to compete next season. Only if that doesn't happen, of course, as you said, the possibility of dismissal could also occur.
There are many problems within the Manchester United squad. And we cannot blame the coach alone for such a bad performance of Manchester United. Even after changing coaches several times, we do not see any improvement in the performance of Manchester United. On the contrary, Manchester United's performance has become weaker day by day.
Manchester United management should first identify the problems of their squad. Perhaps their main problem is their players. Players fail to play well in their positions. The understanding between the players is also not good. Manchester United should look for new players. United management is financially strong enough. So big funds should be prepared for Manchester United to buy players.