The San Siro has undergone a bunch of renovations that reduced seats and added seats.
I don't see why its not possible for us to add 10K+ seats. Sure it might be costly, but its worth it.
Hopefully after the EL final and all the Continassa work is all done, management can focus on an expansion.
Juventus have the most fans in Italy, how is possible that Roma could have a better attendance record than Juve? If Juve had a 50K+ stadium, tickets would theoretically be cheaper and attendance would rise.