We're just trying to get ready for a time where we may not have air superiority. Rapidly deployable mobile resus and surgery teams are already being fielded in the army in a big way. In the last decade, much of our medical doctrine has been predicated on the fact that we can rapidly evac someone by air almost 100% of the time to higher care. The times are changing.
My experience so far has been that MFST teams are often deployed, but rarely needed. That might be due to the ability of air evacuation medics who can get patients to a hospital quickly. The Air Force abandoned the TCCET-extended concept after just a few deployments---for the same reason that air evacuation has been so successful.