Amorim must have a list of players ready to be released. But with the consideration that he also has to get replacements with better skills. If Amorim does not get what he wants in preparation for next season, maybe United's situation will not change. I'm sure Amorim is thinking about many changes in the team, and there will be a few who will be retained. But it may not happen in one summer transfer window. There will be many adjustments that Amorim makes to his team.
First we need to understand what kind of funding he has, and it looks like he will have to sell players he won't be counting on for the new season. Manchester United have a lot of work to do in the summer to become a different team, but based on the current results, I find it hard to believe that Amorim is the manager who can do this difficult job. For now, I think Amorim could follow in the footsteps of ten Hag and be sacked after a disastrous start to the new season.
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.
What we most know about Manchester United is that, the club have face a lot of controversy in the past that have affected the management of the clubs and extended to even their players formations, this have made it hard for the club to make any significant improvements, and this season is not different from the previous seasons where Manchester United suffered similar defeats.
Although this season have recorded the highest positive performance for Manchester United, compared to the last few seasons back.