I don't think anything will happen, Manchester United players and supporters will only just count their losses and try to regroup for next season because this season has already eluded them. Some of the supporters still have patience with the coach because he joined the club at the wrong time, they'll probably give him until next season to see how he starts the next season and how he handles the team before they start probably calling for his sack or be happy with his position as their manager.
The worse that can happen to them is relegation which I don't see happening even in this poor form of their's, at this point it's very clear that there should be no expectations on this team as they are at a stage where they just want to be in the Premier League and hope for a better season subsequently but again they could get something out of the europa I'd they place priority and make some drastic improvement even if it's not looking like something they can achieve with this current form of theirs but with priority they hopefully will.