We have hospitalists where I work. I believe they could be bought and sold just like any other hospital based specialty-anesthesia/rays/ED/path. Before we got the shaft at my old hospital, the neonatologists were given a take it or leave it offer. Most of them left but were quickly replaced. We are all at the bottom of the food chain.
Primary care, OB/gyn, derm, plastics are at the top. Medical specialists (cardiology, GI) and surgeons are in the middle. We are the bottom feeders.
The only times we are irreplaceable are when there are local AND national manpower shortages. This occurred in the early 2000s but the tide has turned. Nothing we do individually in our practices can make us indispensible. You can be chief of staff or sit on the board of the hospital. It doesn't matter. Our job security and negotiating power are inversely related to the influx of people entering the specialty. Chances are your replacements will be just as slick and friendly as you are. The surgeons, nurses and scrub techs will say they really miss you when you run into them at the grocery store. But they won't really mean it. The future does not bode well.