The fact that it is difficult to earn a living as a professional photographer today cannot be disputed. The evidence is pervasive and overwhelming. However, I'm not sure that the prevalence and pervasiveness of digital imaging devices are the only reason. Rather, I think there are several things that all kinda happened at the same time and they interact in complex ways. Yes, digital cameras, and now smart phones certainly have had an effect but, also I would point to inexpensive and powerful image editing software and computers to run it, the internet and, let us not overlook the culture that worships celebrity.
I have to admit that inexpensive, auto-everything cameras that are capable of producing extremely high quality digital images by operators who have,essentially no skills and at essentially zero cost (after the initial investment) have certainly lowered or even obliterated the traditional barrier to entry for doing what used to be paid professional photography. The celebrity worship and the notion that one become a celebrity by getting recognized for some work that can be posted on the internet and therefore, potentially, be seen by a very large audience coupled with the extreme desire by the younger generations to be recognized, drives people do do all manner of work for free (not just photography)....and that has destroyed much of what used be be good paying jobs.
No Doubt.
"Technology" has crippled or eliminated most jobs that it did not create.
Wait until "Self Driving Trucks" are perfected. Can you imagine how many peopl will lose a job from that.?
I was in the painters union. Even in my day, technology eliminated A LOT of jobs.
It used to be you could not paint a wall or ceiling with just one guy. It was all oil based products, EVERYTHING lapped if you did not keep it wet, and if you DID make a mistake, you had to wait SEVERAL Hours to fix anything.
With the advent of water borne products, you could teach a monkey to do basic paint jobs, like spraying an acoustic ceiling or a big wall someplace....the outside of a building for example.
Also, the ROLLER put WAY More guys out of work than the sprayer ever did.
That one, simple, invention decimated the ranks of painters.
Quite a bit of photography is just, simply, not that too hard to do.
I just took a beginner class (film) at my local college.
They have a big hallway that they use to showcase the pictures of the students, especially the digital people.
It is nothing short of AMAZING what a 20 year old student can produce after just 3 months of school ...and in Color.!