Long-time viewer, first-time poster, so take it for what you will. 🙂
While I can't argue with the above, this statement comes from an attending physician who may have applied to Obstetrics and Gynecology programs at a time when the specialty was not at the peak of its popularity. I certainly don't think it was during a time where 600 applicants were left to scramble into another specialty or re-apply! But now you have a specialty that is becoming increasingly attractive, that had roughly 1260 spots for 1800+ applicants last year, and there's just no wiggle room anymore.
I'm not here to sway opinions, but the two major things I feel like you have to decide are 1) whether you would rather risk entering the SOAP (and risk doing something else for a year and going through the interview process again or entering a different specialty altogether) than have one more opportunity to match into an accredited residency program and 2) whether you have the cojones to rise to the challenge that a new but accredited program presents. Every last program in this country had to start somewhere, even UPMC. As long as you can be honest with yourself about those two questions, then you will have done what is best for you, and that's all that matters. I would hate to see anyone miserable in a residency program that wasn't right for them for whatever reason just to have a job, but I would hate to see a new program suffer because they matched someone whose heart wasn't vested in the process (though they'll hardly suffer, seeing as they have been functioning well without residents thus far). As for juniors and seniors, why can't your attendings be considered your seniors? It's not like you'll be left in the wild to fend for yourself. They wouldn't have embarked on this journey if they didn't want or anticipate success for their future residents.
Best of luck!