Would he be even willing to come back, as know matt Smith has indicated he might be?
I don't know. I suspect he might be willing. Smith was good but he wasn't quite as all out amazing as Ten.
It's Ten I find myself longing to see again. He's like a friend who died. I find myself longing to see him return as the Doctor.
I feel like Eleven is better suited to returning using the time he was on Trenzalore and exploiting a long period of time wherein he could be potentially freed from that prison.