It would have been a great trial, with both immediately prior (GOP) Sec of State's called as involuntary defense witnesses to admit they did the exact same thing Hillary did, and further that Colin Powell urged her, on two separate occasions, to use her own private server because the State Department;s computer system was so abysmal.
It was a witch hunt, pure and simple, and the puritans got the government they wanted. Mission accomplished, stupid to continue to pursue it and most likely lose in court. A tremendously successful political con job ala Wille Horton and swiftboating.