She will run again. Maybe not this year, but out of all the crazy ideas to get them together, I can see this one possibly working.
Why should Rachael have to go out West and Zenyatta always get to stay home? Look back at the campaign Rachael has had this year...6 different racetracks?
As a fan I really hope it happens. I like your optimism, but I would set the odds of it happening at about 50/1.