Excuse my ignorance but do civvies get an allowance for getting from home to work? If not then I'm sure that's on it's way. After all the mil (unlike civvies) do generally provide a place to live very near to the place of work.
Cut flying pay to those in flying posts and watch people walk. Okay, maybe not immediately, but many experienced people will have a change in mindset from "stay" to "what's out there". Then again that may be good to get the numbers down!