because the biggest threat to Hillary would be a quick implosion and replacement.
I don't think they can fix this to the extent he can come back to win. Let them drown proof for a while, bobbing up and down, going nowhere fast.
There is a point quickly approaching where they can't change horses. Ballot deadlines start soon and the bulk of them finish by the first week of September.
If he's still their candidate two weeks from now, it's pretty hard to turn back. Maybe they already feel they can't bail out and are stuck with him.
I think he's very beatable and is going to devastate down ticket races.
There is some sign of him settling down. He hasn't done much on twitter for a little while and he's delivered a couple of speeches using teleprompters. So he's starting to control his message (ignoring the crack about not trusting US intelligence).
Probably, pretty soon, there will be a media opening for Hillary and she can announce something substantial and score some points.
Once there's no turning back, then you bait him with stuff that his narcissistic ego can't handle. Some media is probably thinking of ways to do it now so they get "the video". Posters are probably taking shots on twitter. I know I have been.
He'll eventually lose it and implode - like a child in a grocery store whose Moma won't by them a chocolate bar. He'll have his temper tantrum and the downward slide will pick up.
The Clinton campaign and the media can basically toy with him now. It's not hard to figure out what buttons to push. He's not smart enough or disciplined enough emotionally to control himself.