To be clear, I'm not worried (given the info we have) about her health or ability to carry out her job. It's the optics of it all. It's pretty much Christmas morning for Trump right now. As soon as he saw her fall like that he got the biggest boner ever. Trust me. He will make hay.
I think you're overestimating the number of people who would ever, under any circumstance up to and including the alternative being a kitten in a tiny power suit, vote for Donald Trump. The only way he wins is if everyone else is so demoralized they don't bother showing up at the polls, and this doesn't accomplish that because "interchangeable disappointing President dies to be replaced by interchangeable disappointing Vice President" is still the expected "more of the same", which is a much better scenario than "President Fascist Cheeto."
That's one interpretation. I was just calling back to the popularity of the Giant Meteor 2016 meme after it became obvious that the final battle was Clinton v. Trump. I'd rather vote for the kitten in a power suit than the meteor, but I think they make a powerful ticket when you combine them. The softness of the kitten is a powerful moderating force on the directness and destructive potential of the meteor.
Well, I predict Trump will say something dumb and or cruel, which is business as usual. Or he might be super respectful, which would be a big surprise and would be news for that. I can see people speculating on Hillary and her condition which might be business as usual, or calls saying she should step down and is physically unfit for the job of being America's President, which would also be business as usual. Or maybe she'll decide to throw in the towel, which would be super crazy and who knows what road that would take us down?
If we're lucky, the news will acknowledge that skipping out on the 9/11 ceremony with anything short of projectile leprosy would be seen as an affront to the assorted people dragged out whenever you wish to assert an affront and that once she was there, leaving early would be an even greater affront etc. until you have a politician feeling so shitty that she's gotta bolt and lo and behold there she is, Weekend at Bernie's on cell footage. If we're unlucky, the news will question whether or not Hilary Clinton has projectile leprosy.