That is assuming, of course, that there hasn't been a review of where the SAR units are located by then and the units cut or amalgamated. Not saying there will be, but it's been done before and who says it wont happen again to help reduce the costs for the MCA?
However, assuming all the units will be civilianised there will of course be some ex-military who will get jobs. However, there will be others lurking in other civil operations around the place who may very well have the requisite SAR experience as laid down by the client/winning contractor and not all will go to guys (and gals) straight out of the military.
I understand your protectionism for you and everyone in military SAR and it is very sad for the military to lose the role. However, don't expect it all to come to you on a plate. You will be competing for employment with everyone else.