It's astounding.
But two things will get people to vote for that:
1. Not paying attention.
2. given the same lie enough that Trump is crazy people believe it.
At this point Trump needs to out her illness during the debates. Those that are not paying attention love sound bits. Her falling down or something will keep them from voting.
Best way to do that is when she is in the debates find the handler of her ear piece or disrupt the ear piece with a scrambler. All she will hear with a jamming device is white noise. Trump can say we don't want cell phones in the audience we're scrambling all devices.
For that reason it is possible Hillary won’t debate. Her excuse in that case will be that Trump is double plus ungood and thus not worthy of debating.