You are right. Juventus are looking to stabilize their forwards and midfield this season with the addition of Di Maria and Pogba. Now if De Ligt goes to Bayern Munich, Juventus will have to find a new defender. Finding a talented defender like De Ligt will be a tough task for Juventus. Perhaps next season we will see a slightly weaker defense from Juventus.
If De Ligt leaves Juventus, of course Juventus will move quickly to find a replacement. maybe this time Villarreal defender Pau Torres is the player Massimiliano Allegri is targeting in the transfer market this summer, he is one of the names that is widely rumored to be the target of Juventus if De Ligt officially leaves. Negotiations are ongoing at the moment as Villareal are rumored to be pegging the defender for €50m. Juventus envoys are in talks with Pau Torres agent if in the next few days an agreement is reached. I'm sure Juventus will release De Ligt to Bayern Munich because Bayern are the front-runners who want to get De Ligt.