Franklin, like Forestall, would have sunk. Can't I even make an analogy here?
Not if you don't tell us what your analogy is. The Franklin's sinking was like getting shot with a shotgun, the Forestall's bombs going off is like someone throwing the pellets at you. Very different in the effects.
The Forestall, like most other naval ships, was
designed not to sink if a fire broke out. It would take more than a few detonated magazines and a lot of exploding fuel before anyone would even think she might be sunk. And the US Navy wasn't entirely incompetent, they do have some knowledge of shipboard fires, and no idiot wants a fire next to explosives. They're going to do their absolute best to keep the fire out of the areas filled with fuel and explosives!
Now, if, due to some sort of
mumble-mumble, the Forestall was sunk in 1967, most of the crew would probably be saved. There would be a morale drop inn the US, a moral boost in the NVA and VC, and the US would have more determination to pull through. It's also very likely that US aircraft get a couple, just a couple, bombing restrictions lifted. (Maybe we can bomb a SAM site before it fires at us!) We still likely pull out of Viet Nam on schedule, and no real butterfly effects, excepting the need to shuffle a couple of carriers around the ocean. The only time this will really make a difference is come 2000, where either McCain won't be present (due to death, diffrerent career choice, etc., likely) or he will be a still be there, with a different personality (surviving a sinking can do that to you) (less likely). Either that, or there's some other Senator in his place. The election may very vell swing to Gore or to Bush, I don't know, it was close enough in OTL. I really don't know what the 2000-2008 election cycles would be like without McCain. That's for someone other than me to describe.