The number of spots offered for integrated & traditional programs have been relatively stable for a few years now & I don't think that there will be a whole lot of movement on that front for a awhile. As surgery (as a field) is moving towards four years of core training with the subspecialties (trauma/CC, peds,transplant, cardiac, +/- vascular) prior to starting those fellowships, I think there will be less momentum for programs to switch to integrated & more of the traditional programs (that haven't already) go from 2 to 3 years of plastic surgery training to remain @ ~7 yrs of residency for PRS training.
There are a great many people in academics who remain skeptical about the whole integrated program concept & are not inclined to retool their programs. You've got to remember that @ many institutions Plastic Surgery cannot just unilaterally seccede from the Department of Surgery & write their own curriculum. In fact, many Plastic Surgery divisions are as weak politically as they have ever been in academics as whole generations of Plastic Surgerons abandoned academics to do cosmetic surgery. I believe that you're also likely to see several training programs collapse & dissolve (like Case Western recently) when the finances and personel stability of some programs become unsustainable. These factors work against large scale changes in the near future the way I see it.