The biggest problem in the future is finding a italian core (4-5players) strong as the ones we had till now.
Next year we'll lose Buffon and Barzagli. Chiellini is going to be 33yrs old soon let's say he has 2 more season on him? considering all the problems he had in the past 2years.
Marchisio as well has 3 at best 4years but not as core member anymore.
as cbs we got Rugani and Bonucci which are reliable. We'll need to find a Goal Keeper as i don't think Neto it's long term solution.
Sadly so far i don't see much of italian talent in the midfield Verratti aside.
I like Baselli and Benassi. Galliardini looking decent at Inter but that's it.
While in atk positions Berardi,Bernardeschi and Belotti are getting better and Better. But in those positions we're filled with talents-big players.
Anyway we need a new Buffon and I don't see one atm. Donnarumma looks like Scuffet 2years ago before Udinese had its revenge on him for refusing a 15m transfer to Atletico Madrid.
If you ask about post Buffon I'd pick Oblak or De Gea but then again they're not italians.