@guard_dog this is a well thought out and interesting observation. I have noticed the same over the years and am intellectually curious about the future of this trend. I do think we will start seeing more purposeful purchases and thus breeding to suit.
with the massive influx of illegal aliens into the United States, citizens are becoming more safety conscious. The protect themselves and their properties, American Citizens are arming themselves at a rapid rate in spite of the Government's attempts to vilify the population who are armed. Those who are not in favor or the traditional American Way of protecting themselves will eventually revert to and seek out Guardian dogs.
In a few years I predict there will be a massive demand for serious guardian dogs.