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Hopefully the evacuation aircraft will operate with recirc fan off, amongst the other precautions.
To get serious about it, the crew involved need protection for the flight, including in the slip accomodation, and then on return they need to be placed into quarantine as well, preferably separate to the great unwashed passengers. The aircraft then also needs to be held out of service for the maximum latency of the virus on a surface, HEPA filters changed out, and tested for residual virus load prior to returning to service. None of that is being done at present with the aircraft plying their trade around the region, into other ports etc, so the likelihood of stopping the spread of a virus that has a current contagious phase while the host is asymptomatic is pretty low.
If there is any bright lining, the severe complications appear to be a limited subset of older, or immune compromised, diabetic, cardiac or pulmonary compromised subjects. If that is correct, or remains the case, then medical care outside of China appears to have a fair chance of minimising the adverse outcomes.