I've
blogged on this a bit.
I particularly like the work by Christine Moutier (great psychiatrist now with NFSP), modeling burnout on a model of reservoir/depletion.
http://www.ncbi.nlm.nih.gov/pubmed/18270280
Really I think the dynamic exists in all relationships, where we invest energy with an expectation of someone doing something in return. We put energy into a project with the expectation the other person will agree. We treat patients with the expectation that they'll accept the treatment. When we overextend or do more than they do, we get strained and eventually burn out.
So the trick, in that model, is to
1. replenish through doing things that nourish you (refill your reservoir)
2. Don't work harder than your patients. Which means tempering expectations.
3. Extend yourself selectively. If they work hard, then you work hard.
4. Don't see failure as an indication to work harder.
Of course this doesn't address systems that are all stress/pressure based that don't make it possible to do all the expectations put out there. I agree that's a system problem, and we have to then either leave the system, change the system, or change our expectations of the system (which can feel like apathy).
In the Nesse evolutionary model for depression, we shut down when we have a goal that can't be achieved, and can't be given up. We shut down to conserve energy. We want to hibernate. With the direction that medicine is going, it makes sense that we're setting up unachievable goals, and the only solution feels like leaving the system and dropping the goals.