Actually, given their obsessive preference for male offspring, this may actually lead to an overall reduction in their rate of population growth. If families have access to the option of selecting the gender of their child before fertilization, we may see an increase in the proportion of males within the population, reducing further the capacity of the population to produce offspring. This may also decrease the incidence of mysterious "disappearances" of female Chinese infants.
Seems like a win-win to me. Of course, this may in fact go against China's economic interests, as population growth tends to be a good thing for industrialized nations (until a certain point). Also, it's likely that those able to afford these services may be few and far between, so it may be a moot point either way.