Well in Sir Alex Ferguson era, Manchester United name was shining and things in the team weren't great after him. Ten Hag saved Manchester United in the beginning from a disastrous season and he was able to win a trophy at least this season. I wouldn't say that he was the saviour or the best choice but at least he tried but Manchester United needs more qualified players and to rely less on players that no longer can add something to the team.
I agree that a new coach and new strategies are a must to improve the team especially with a comprehensive staff that could give some money to recruit new players so a better outcome would be expected.
To be honest I don't know where it's salvageable, but since they won a trophy this season, so be it, well done Ten Hag for achieving at least that despite such poor results within the league. So far there is no news about the new coach, not even any serious rumours about a change of coach, it's sad at the moment. Well, there were rumours, but they stopped for some reason.)
Manchester United's management must as a matter of urgency go in search of a new world class manager that'll help the club become competitive again unless they just want to settle for struggling to finish in the top seven at the end of every season.