As for any probing of a mental or medical condition with Hillary, that is destined for the "unsubstantiated VRWC" pile, where it will meet claims that Obama's Hawaii BC is not authentic; that Vince Foster did not die in Ft. Marcy park; and that Juanita Broderick was raped.
And even that fate will not be enough to kill it off. Any "Hillary is unfit" claim, whatever its basis in evidence, will be cast as misogynistic and mean spirited.
On her health we have photo after photo that will become increasingly tough to explain if they keep up. Only time will tell.
Overall though you are right. We will see excuses for her behavior and non-performance(what were her five most brilliant accomplishments) like never before.
When you are a long time politico and have nothing to hang your pant suit on you are in trouble.