That e-mail, while doing a lot of wandering, certainly swerved into very good point:

Hearing an American accent on the practice area frequencies in the PHX area is the exception, not the rule. It would seen that a whole bunch of the certs issued currently are for non-US citizens....I know that my employer alone is more responsible for nearly 300 student pilot certificates per year that are used solely for training and produce pilots that are not employable in the USA.

The FSDO reports that CFI-initial rides have nearly come to a complete stop.

It'll be interesting to see how long it takes the market in the sector of aviation that traditionally follows instruction to respond to the shrinking pool of even 1000 hour pilots.