I can't say what the official line is but if you are part of a 'dying' trade you are out much quicker. They seem rather pleased to get rid of me (F3 Nav) when I applied a few years ago, and that was when there was a shortage of 'middle experience' F3 Navs. So the powers that be looked to the long future where I may have been more of a burden than I was at the time, rather than the immediate case of shortage of 2nd tourists. Iwas out in about 3 months+resettlement.
Or maybe it was just me
