I think 2010 was the swan song for many there, Chivu, Zanetti, Samuel, Lucio, Cordoba, Cambiasso, Stankovic and others. Many of their players were well up in their thrities and a decline was obvious after Mourinho left. It's part of the reason he left IMO, he knew he couldn't have repeated the 2010. Milan made several good transfers in the summer of 2010, including the signing of Ibrahimovic. Bottom line, you may think differently, but, at the time, I knew in advance Inter will have a major fall after 2010. It just wasn't the start of a dominant period for them, you could tell by looking at their team, the average age was like 32 years old or smth.
That team was done at the highest level. They gave it all in 2010 and that was it. Feel free to dissagree.