There is hope in the future. Two reasons:
1 - David Gilmour, Nick Mason, and Rick Wright managed to play with Roger Waters again as Pink Floyd for 4 songs at Live 8, and even shared an embrace (and aren't fighting anymore, as well).
2 - The Beatles manged 2 new recordings even though John's passed on (Free As A Bird and Real Love).
There's more friendship in Lisa and Damien than there ever was in Gilmour and Waters. Not all hope is lost.