The story vanished quickly because Trump can't really use any part of it to spin into his agenda beyond trying for sympathy (lol) and the most vague of "I nearly died for all of you" empty platitudes.
Can't rally against the Radical Left for trying to take him out since by all accounts, the guy was very conservative and Trump was a target of opportunity more than one of ideology. Can't use it to make a point about gun violence since he leads the party that opposes all forms of common sense gun access reforms. Can't make any point about mental health because he leads the party that doesn't give a fuck about mental health in general and would oppose any sort of proposal to make such care more accessible. Can't make a point about a wider rise in violent culture because he actively stumps for violence in his own rhetoric.
About the only thing he could do is throw the security setup under the bus, which has somewhat been going on, but unless he wants to try and claim that the Secret Service was setting up to get him killed intentionally, there's nothing there to really help him from an electoral standpoint. Even the fact that he's physically completely fine means there's no visual symbol for him to draw on other than the raised fist photo, and they've been using that in the tackiest ways possible. The whole thing was just an unfortunate waste of lives.
