At this point Hillary is toast. Any attempt to indict and convict her, while more than justified, would just be a distraction. He should however go after Chelsea so that her political career is aborted before it starts. Seems like fitting justice to me.
Realistically, Chelsea is going nowhere, no matter how hard the DNC tries. This was a strong rebuke of the Clintons and their highly corrupt machine. If they want to challenge Trump in 2020 and make gains, they need to drain their own swamp like the conservative side did and obliterate the Clinton/Soros machine. The DNC cannot expect to make any serious challenges for 2018 or 2020 the way they are now.
I believe Hillary should get indicted to the full extent of the law and justice should be served! However, with no power at all, the punishment would be a lot less now than if she was President (in which case November 6, 2018 would be doomsday for the Democrats).