Mr. Ares Randland has had 996 years of relative calm, the entire time the population has been decreasing, it isn't subtle and unnoticed, it has been noticed, Ingtar says it out loud.

What is unclear is how it is happening... what mechanism is in effect? why just randland and not the Aiel?

It doesn't make sense.

I just classify this thing as part of the language and unusually large army debate. just illogical inconsistancies that are difficult to justify.

Personally I wouldn't be surprised if the trolloc wars involved genocide in captured territories, but I doubt that would have much effect on current populations.