Manchester United is scared if they might enter relegation zone if the manager is still Amorim, but they forget that they signed Amorim because Amorim was successful with Sporting Lisbon.
Unai Emery is quite successful with Aston Villa, but it doesn't mean he will successful with Manchester United.
Emery once trained Arsenal, but he was not successful. Manchester United better to recruit Xabi Alonso, Ancelotti or Pep, we haven't see star managers manage Manchester United.
I don't understand why they are considering sacking Ruben Amorim to make way for Unai Emery. We all saw how effective and successful Amorim was at Sporting Lisbon. Sacking Amorim will be a mistake in my opinion, while Unai Emery has done a fantastic job with Aston Villa, if he joins Manchester United without the club addressing its deeper issues, he will likely struggle as well. Without structural changes no manager will succeed at the club.
I also think Ruben Amorim should stick to one pattern of football and make his intentions known to the players instead of using different patterns that may not be comfortable for the players, I think sacking Amorim without addressing the problem of the team will also not become of any good since the coach is yet to identify the ways to solve the problem surrounding the team. Sporting Lisbon is a different team under a different league Amorim may not achieve the same good results he had with Sporting Lisbon but sacking him won't be a good idea I think he should be given another season after he must have brought in new players to solidify his squad but if the management considers bringing in Unai Emery as replacement for Amorim, then the team will still continue losing games if there is not solution to their bad record.