What tends to happen is that people fork out the £12000 or so first, get the multi IR etc., then sit about for ages bombarding people with CVs until they get fed up, then go and spend another £6000 to get the instructor's ticket to keep flying while they wait. Not an ideal situation but as long as instruction pays massively less than the airlines one which will continue. Unfortunately the only people who can afford to be instructors for the love of it don't need the money so the situation won't change (in the near future anyway).