Take the 80m and be done with this issue. I don't get the mentality of keeping MDL for a year with probably little chance to win the CL. Rebuild/retool whatever this year not having him instead of doing it next year. I don't get the idea lets hold him for 12 months to possibly get 10m more to make the financial books look better which I believe wouldn't happen anyway?
Unfortunately MDL is gone sooner than expected but Juve presently isn't financially capable of ever retaining him for the long haul. When it comes to money appears Juve is 1A while lots of EPL clubs along with PSG, RM, Barca, and BM are 1s. The kid sees the club has been a complete mess the last 3 years so who wouldn't want to leave. I do like him and only wish him the best.