This is gonna be fun.
They want a smaller stadium, with a 12% capacity reserved for VIP seats, like EPL, meanwhile this means that tickets and season pass are going to become very expensive, also very difficult to obtain.
This is how you increase your stadium revenue, by milking your loyal supporters like cash-cows.
I presume they will be disappointed when the new stadium will not be at full capacity for 90%of games, since in the past we likely filled San Siro for 45k on average.
People don't like to spend big money to watch a football game, for example a four people family would take into account a €200 per game, considering 4 tickets (40+40+25+25=130), parking (€20), dinner and fuel.
How much would cost a season pass?
300 plus fuel and amenities?
Most people would take a tv subscription, and we will return speaking of half filled stadiums except for big games two or three times a season.
The alternative is to keep the 80k capacity and don't have to increase prices for normal seats, while making VIP more expensive to compensate.
Of course, they will make a 50k stadium, I know already....