The problem with using this tactic is that it will cause people to once again question her health and whether or not she's physically capable of handling the presidency. I think a more likely scenario will be a sudden health crisis for Bill, causing Hillary to to delay her appearance before the select committee while she "keeps a vigil by Bill's side during this very difficult time for the Clinton family."
I fear for Trey Gowdy, hope he has some good security. The clintoon machine has lots of practice in making problems disappear and the media certainly wouldn’t question if Trey ended up shooting himself in the head a couple of times.