Surely another reason why it is wrong to assume that reincarnation should maintain a stable population is that (according to Hindu tradition, at least) we don't all come back as people or originate as people. Many incarnations are spent as lower animals and on various other planes of existence, and the nature of these reincarnations depends on our actions in previous lives. Similarly, the lives of lower animals will lead karmically to other incarnations, including human ones. So here's a theory: maybe in recent centuries there has been a rise in the moral fibre of earthworms, and our human population explosion is mirrored by a decrease in the earthworm population, as more of their souls migrate into human form.
Or possibly the whole theory is an ancient superstition, which 'mediums' (i.e. cold readers) still find it convenient to promulgate, or can't bear to reconsider.
After all, it is so hard to discriminate between a vision and a hallucination. In another blog on reincarnation, Erin, you say:
All I can tell you is that it will be fine and you’ll understand when you get there.
Thanks. I will go to my grave contented now. How much do you charge, BTW, if I need more help in person?