I think Dave has already cast an attempt to Roger. From the Division Bell: 'So I open the door to my enemies, and I ask could we wipe the slate clean, but they tell me to please go **** myself, you know you just can't win.'

To me, that says he tried to make up with the guy, but Roger just doesn't want to hear it.

Now, they are both older and fixed in their solo stuff, I think it's improbable that Roger will return.

If it did happen, I think it would be absolutely awesome!