It's the way it works. Some companies rise to the occasion, others don't. PSA doesn't seem to be, and they probably will be out of business in a few years. Simple as that.
Took 3 weeks for my upper. Having lived in the Fal world try buying something from DSA. I have been lucky with wait times near 6 months. I know some that waited almost a year for there stuff and they are still around.

Almost as much fun as waiting on ammo from Sportsman's Guide.