More abortion doctors are closing in on time to retire, and the new doctors to take their place are coming in very low numbers. Without an infusion of new providers, attrition alone will deal a deathly blow to the sustaining of the abortion business. That motivation is almost entirely absent now. Young doctors are much more likely to have witnessed negative medical or psychological after-effects from legal abortion. That might serve as a motivator to those who think they can be better and more professional than the ones who caused the problem they witnessed, but it's more likely to dampen enthusiasm for going into the field.
Young doctors see that doctors who do abortions get little respect.
Nor is it terribly comforting to be one of only a very few people, as the numbers dwindle. This was not how legalized abortion was supposed to work. In addition to the fact that it's a surgery that people attack or defend, abortion is distinguished from ordinary medical care by many oddities. It's remarkably centralized, since most of it occurs in clinics devoted to abortion as their major function. Patients ordinarily know their doctors before surgery and get follow-up care from those same doctors, yet this is unusual in abortion practice.