Hello99
If you have anything concrete (or even anecdotal) indicating that the growth rate is dropping I would love to see it. In any event I would find it hard to believe that the drop is so precipitous as be significant enough to eliminate the issue. From the data I have seen (class size etc)the reverse seems to be the case.
If you are right then in 10 or so years we will not have a problem – a different albeit important point.
Once we are getting down to it another relevant point that has to be taken into account is the tremendous advances in reproductive medicine over the past ten or so years.