Experience alone is not enough to bring a team to become a champion. Allegri needs to get support from management to make player purchases that Allegri needs. Many names of players are rumored to be Milan targets, but until now there has been no deal, except Modric just almost coming to Milan. If management does not immediately make a decision to support to buying player as Allegri expects, then it will be difficult for Milan to be better next season. Maybe they are just made a target for UCL, not to be a champion.
I agree with you. Experience is of course an important plus especially if he has a good history with the same team as well. However it isn't enough by itself. I don't believe Milan squad is good enough to play for a Serie A title yet.
They can strengthen the midfield for example. I don't see it solid enough. They need to build a strong bridge between defense and offense. Modric is a good move but he is very old.
In the attacking line I hope to see a good season from Santiago Gimenez next season. He is really talented and can increase the productivity more.