Regarding player recruitment, I think it is definitely necessary to do it because some players who often make blunders and make Manchester United lose clearly have to be thrown away, including one of the goalkeepers who I think is not worthy of being maintained by the team for next season. In addition, Manchester United's attack line and defense line also need to be completely overhauled because the two lines are really weak and not sharp at all to make the team superior.
MU needs a total chang, the problems faced by MU right now are really severe. All lines of MU players do not show optimal game results. In my opinion, not only changes from the players and coaches, but also from the management and staff/sports director of MU must also need to proven about their capacity to bring in new players and good coach for MU. If the current owner is no longer able to solve the problems from all lines of MU, it seems that achieving the championship will also be difficult.
I agree with you, they need a total overhauling of players and of the Man united management team as well, they can't be doing the same thing over and over again and be expecting a different in result. In fact it's better they even start from the scratch and offset almost all the and retain a little key players if they can get the needed results, and further restructure a whole lot of other things going wrong within team management, this way, they will be able to figure what is really the problem with the team and if it's not gonna help them solving their almost a decade of problem.