wvu,
It's true that there have been problems with some dropouts with combined plastics residents. Many of them don't realize that a 3 year committment to general surgery, which is usually the case, is a serious commitment and with the exception of truly integrated programs (i.e. michigan, baylor), most plastics programs are combined, that is strict 3 years of general surgery and then 3 years of plastics. Most integrated plastics residencies actually have minimal dropout rates because their years are tailored with subspecialty rotations and plastics-oriented rotations.
I'm a combined plastics resident at Yale and there is a 3+3 combined residency in place; for the past 4 years, 2 out of 8 residents have dropped out during their GS years.
That being said, I think the 3+3 or some sort of 6 year format will remain because of the substantial pressure to train plastic surgeons in 6 years rather than 7 or more. Therefore, more and more medical students are being encouraged to match out of medical school. There will, however, remain traditional fellowship spots and programs such as duke and hopkins are trying to retain these spots in spite of the push for more combined programs.
Keep in mind the difference between combined and integrated when looking at plastics programs. There is a big difference and there are positives and negatives to both.
Hope this helps.