F4, no matter how much you cut the cake, the Navigator/WSO will be a very small group. There will be pressure from today's fast-jet WSO as well as new entrants.
The numbers being recruited will be a fraction of the number of pilots. One has to ask the question, why WSO and not Pilot? It was asked of me and at the time we were recruiting 20 navs per month and perhaps 4 times that number of pilots.