[1010RD]

If his sampling is representative then we should expect over 1000 languages with ejectives, no? It's not clear that his methodology is sound. A sample size from a population limit of 7000 isn't really necessary. Why not just use the entire population, particularly since your focus narrowly concentrates on ejectives?

[SunkenCiv]

Human population tends to be lower altitude — of the approximately 7 billion people, over 90 percent live at or under 1000 feet elevation. In the US that may have started to tip lower, because of the areas around Phoenix and Denver, and Phoenix isn’t all that much higher than 1000 feet.