Not all fans were waiting for Grissom and Sara to get together.
Why was there no 'hot' scene between those two, because most of us wouldn't have been able to stomach it. (sorry to be so blunt, but it's the truth). There was no romantic chemistry between those two.
However, I do miss Grissom. He will always be a favorite character of mine. I would love to see him back, but not if it means him constantly working with Sara.
However, we've had years and years of 'GSR' and we don't need no mention of it. I know as a GSR fan it sucks for you, but for the rest of us we can finally enjoy the show without it. CSI was not about GSR (even though Season 7 was all about it).
Catherine and Vartann's relationship does not take up every episode nor have we dealt with season after season and that relationship makes more sense.
That's my opinion.
But yes, I'd love Grissom to come back, but everyone needs to accept that Billy is not coming back. Maybe for a guess spot and I would hope for the last episode, but he's done with CSI.
Having a Facebook page to bring him back I really don't think will do no good. (sorry to burst a bubble), but it was the actor that wanted to leave, not tptb.