You bring early conclusions that de Ligt would leave Juventus after few years from Pogba case. When Pogba left that were different periods for Juventus without so strong financial power like today (Agnellis did not invest a lot of their money, and Juventus did not have strong sponsor deals with Nike, Jeep, New Holand and etc). Also Raiola has brought a lot of his players to Juventus and only two left in circumstances where Juventus could not handling situation; Ibrahimovic (Juventus was moved to Seria B and he did not want play there with reducing wage) and Pogba (Juventus need capital gains in their financial books). There is also example of Nedved when he had strong offers from Barcelona and Real Madrid and he had not wish to leave Juventus even that meant that he would had played in Seria B. Raiola did not want to make efforts on his decisions. After few years when de Ligt would want to leave Juventus will offer him significant rise up of wage which any team could not match up and he will stay (new tax rules in Italy also help where is tax rate around 25%). Raiola just has done best for his clients but he has not moved them for every price because he also get money from contract, especially from agent fee when his player signs contract extension (also there is loyal fee). So point is that de Ligt will not leave Juventus for any other team except situation where he could seriously flop.