I doubt this will run its course before November, but if it can be a drain on his sanity and coffers, I'd say it's still in the public interest to keep it going. As someone who listens to Knowledge Fight often, this kind of stuff gets under their skin and derails their ability to be effective at messaging.
Ultimately, it's in the public interest to keep going, if only because it's still a crime that deserves to be tried on the real possibility that he loses in November.