Unfazed,
From my recollection of first-year Economics, factors 3-5 should provide an upward pressure on instructors pay; 3 would increase the opportunity for profits from the customer without being undercut in the marketplace; 4 and 5 would tend to reduce supply and therefore increase the value of an instructor to an employer.
However these factors are undoubtedly outweighed by 1,2 and especially 6, which is the real problem within the industry.
There are probably a few out there who would probably pay for the opportunity of using an instructors job as a springboard for the airlines, and probably many who are in denial about the fact that, all things considered, they probably do.
The exploitative attitude therefore works both ways.