Personally, there is and only ever has been 1 argument for a Hunter having Might over Salvation. That's bumping up the tanks threat with Misdirect. However, I don't feel that the risk is worth the reward. Mages can dump 100% of their threat and IB if they do pull, Warlocks can dump 50% of their threat, but you don't see them running around without Salvation. Why should any of our top damage classes be any different? As for popping FD every time it's cooled, I personally think you'll see a larger dps drop from that over not having might, and no I haven't done any TC to support that, that's just my opinion.
I've said this before and I'll say it again. As a raid leader it is not worth it to me to risk a full or partial raid wipe due to one person's threat. If EVER an FD is resisted with the way our Hunters are currently using the skill, it will result in them pulling the boss, and like Tach mentioned god knows howmany posts back, healers do get their faces melted during the time it takes the boss to run the 30yrds to take your face off and get back to the MT. So I'll make this extremely clear: A slight DPS increase for Hunters is NOT worth the risk of getting a healer killed, end of story.
If you guys are so obsessed about the buff, lose 1 of your other ones. Kings, Wisdom I don't care. I am well aware that you guys know how to play your class, that's not the dispute here, and I know that 9 times out of 10 FD works fine. It's the times it doesn't that I care about and that I don't want to see. There is no reason, once we understand a fight to ever pull off a boss for anyone (myself especially) and as a raid leader I need to look at the raid as a whole not just the Hunters.
It's the thought that counts, not how many people die because of it.