Besides his scandalous habits, there isnt much to say that this guy would be such a bad pick. President for us is just a front guy, a smiling figure who is supposed to be charismatic. And this dude besides the Agnelli connection, seems to be quite popular (before the scandal) in his industry and the celebrity world (similar to his grandfather in reputation for being well dressed and in the in crowd of the world), having a yes man task of smiling for the cameras wouldnt much for him, especially as his love for Juve is evident. He would only need to clean up his act to do this task.
The real meaningful roles of running the club should go to someone like Bettega.