Counter point: Black Death.
Killed people at random, poor, rich, regardless of occupation.
When it finished incomes increased, home ownership % increased, standards of living increased, and the middle class exploded. All while Europe remained relatively isolated.
Kill half the doctors? Well, they only have half the patients to see anyway. Half the farmers? You only need half the food now anyway. Half the X? (and so on).
With most of the infrastructure in place already, along with no loss of technology and now a disruption to established wealth (but relatively stable GDP per capita through the crisis) you would likely see economic growth.