Very true. Of all people, I should know what things that are totally out of your control can do to your time goals.
I do like the idea of mixing up the seasons. I have yet to do two marathons in the same year and I honestly don’t know if I would like trying to do that. That said, decide what is best for your upcoming season. If you feel confident in your ability to do the marathon now and get the BQ behind you, go for it. If not, I would suggest focusing on getting healthy and fit for next year to take your best shot in the spring. Worst case scenario, you do another fall marathon next year instead of this year. Best case scenario, you get another month or two to build your base this winter and exceed your spring goals.