You are very welcome, Myles. I avoided the rather wild tangent that others went off on by confining myself to the broad and readily observable social and economic factors involved. While they won't appreciate my saying so, the tangent they went into - religion, ethics, stem-cell research, etc. - is only a VERY narrowly limited slice of the issue and has almost no impact at all on the greater scale of things. It's certainly an issue within itself but isn't even remotely connected with the decline of students in college that are studying the "hard sciences."
Here's another bit of insight (in my opinion) for that decline. 50 years ago, science was seen as almost glamorous. A well-paying field and most parents hoped their children would pursue a career in science, medicine (or the unrelated legal profession).

Doctor, lawyer or scientist - those were the lofty goals of that period. Because those were where both the money and prestige were.
But today things have significantly shifted. Most parents now are happy if their child can FIND a job - any job that pays above minimum wage. And instead of the venerated halls of ivy, a great deal of the education beyond the basic 12 years is becoming increasingly done in technical schools - which reinforces the specialty trend as opposed to a broad-based higher education.
The countries you mentioned, and others as well, will find themselves in exactly the same boat as America and the British Isles. As the whole world continues it's headlong rush into what I call "instant-gratification consumerism", it's sad to note that serious basic research will only continue to decline. Will there ever be a turning around point? I only wish I knew.