It's not all that complex. Break it into simple to understand terms. You own an aircraft repair shop. All of your personal expenses come to $5,000.00 per month, house, kid in college, cars, groceries, etc. Your shop expenses come to $5,000.00 per month, hanger rent, tools, utilities, etc. That means you have to have a gross income of around $15,000.00 per month.
That equates to servicing a minimum of fifteen planes per month, assuming you average about a thousand dollars per plane in labor charges. This hypothetical shop has no employees, just the owner.
So at first your doing fine, then fewer planes come in for servicing, you are averaging only ten planes per month. That means you have to raise your prices on labor to $1,500.00 per airplane. As the number of customers keeps dwindling, the higher you must raise your prices on each airplane you service. When it reaches the point that nobody comes to your shop, then you fold.
The same holds true on all of the aviation industry, the fewer the customers, the higher the prices have to be.
When I owned an airplane, I spent around five thousand dollars a year in the aviation industry, that is now gone. The remaining participants will have to either find someone to replace me, or they will have to start paying a little more to be a member of the community.
It will eventually reach the point when there are not enough participants to support the industry, then it will be over. The only bright star in GA at this point is the LSA and experimental market, the certificated fleet is going by by.
It does you no good to buy a great used airplane if it costs more than its worth for an annual, or fuel is thirty dollars a gallon because they do not sell enough of it.
-John