1. There's no way that his handlers can allow him on a debate stage next week.
2. There's no way that they can keep him off. His ego wouldn't allow it, and it would be obvious that his mental decline would be to blame.
Earlier today, I read somewhere that he did a "press conference" over this last weekend where he rambled incoherently for 10 or 15 minutes, then wandered away from the podium without ever answering a single question from the press. I'd love to see him do the same thing at next week's debate so that EVERYONE could see how far off the tracks his choo-choo is running....