I would say De Ligt would be a SUPERB transfer for United, Bayern may start looking for something else and I can understand that, they want a much more fast defender near Kim Min Jae, and that is not a bad idea, the passer CB situation is great but they just look for something else.
Meanwhile, United does have problems with defense, so getting De Ligt, not only a great defender but also someone who can pass out of defense, which United is lacking direly right now, is very important and would improve their team drastically. That would be the highest amount of improvement of a team with a single player type, not only because De Ligt is good, which he is, but also they are getting exactly the type of player they are in need of.
If Man United can sign De Ligt, it will be a good addition for Man United defense. However, De Ligt very often gets injury, Man United must get the solution for his injury. If De Ligt still has the same problem in Man United, Ten Hag won't get anything from De Ligt. De Ligt must spend a lot of time for recovery, this case is similar with Neymar who is prone of injury.
The chance to sign De Ligt looks quite high because Bayern Munich has many option for center-back. Bayern Munich has Upamecano, Min-jae Kim, and Josip Stanisic. They are also rumored to sign Jonathan Tah from Bayer Leverkusen. So, there will be enough players to replace the position of De Light. By the way, De Light isn't the main defender in Bayern Munich, too. So, it won't be a big deal for Bayern Munich if they should let him leaving the club now.
However, Bayern Munich wants $70 million for De Light. If Man United can pay the transfer fees, De Light will join Man United for the next season. This is the related news:
Bayern can sell Matthijs De Ligt at $70 Million