The effects of commercial pressures.
The problem with up-skilling the instructor workforce is that employers are wary of creating a requirement for skill levels that are expensive to deliver and make the instructors concerned a valuable, highly prized and therefore potentially highly priced commodity. Nevertheless it is essential that we try to achieve exactly that - a corps of highly skilled and experienced trainers.
There is an inbuilt, maybe sub-conscious, desire to have floods of quick-and-easy-to-train TRI's that can be found on every street corner and are cheap to hire.
As Non-PC Plod said, finding someone - anyone! - to fill the billet is not hard but finding the right kind of 'someone' sure is.
G