Actually, for many years, Roger was all stuck up and "too good" to reunite Pink Floyd, even though the rest of the band wanted to... Then David Gilmour decided to put the band back together without Roger, and they did quite well. But it was dwelling in the past for David, so he decided to concentrate on his solo career, working with his wife. But he also decided that he needed something from the past, and he brought Richard Wright in to work on his solo stuff as well. "On an Island" is the result, and it's quite good, but of course, it still sounds a bit like pink floyd, how could it not.
Anyway, after the Live 8 Reunion, Rodger decided that he'd like to put PF back together, especially for the huge piles of money that were being offered. David said "no thanks!" In an interview I read, he pretty much said that Pink Floyd was his past, and he wasn't interested in reliving it. I think that he also remembers the quote by Roger, "the other blokes, they work for me!"
Mark
I heard a great radio interview with David Gilmour last year. He was promoting ‘Island’. Gilmour was actually very laid back and interesting, talked a bit about his amazing guitar collection (particularly Stratocasters). He has an old Strat with a 00001 serial number.
Although he didn’t bad-mouth Waters, he did say that Roger tended sometimes to take more credit for songs and musical passages than he should have. Gilmour offered a few examples. He didn’t sound vindictive about it, just a little annoyed. It didn’t sound like David was in any hurry to reassemble Pink Floyd.