Well I'd quite like Aherne to take over as showrunner one day, sounds like he's the only one Eccelston has any respect for. Shame as I thought he and RTD had had a good relationship beforehand.
Unfortunately, it's been pretty darn clear that they didn't. What I was hoping, however, was that with a new team Eccleston would've felt OK returning.
It's possible that down the road things will change enough, wounds will heal, etc that he'll be up to return for a special.