It's the same argument advanced by Margaret Sanger and her Eugenics movement.
As we continue the drift to socialism, this argument will become louder and louder. Couples will be forced to murder their unborn child if diagnosed with disabilities as they will "cost" more.
However, this overlooks the situation where a teenager or adult becomes addicted to drugs, nicotine, etc which all drive up health costs.
The NHS hates healthy people even more than they hate the disabled. They did a study and found that people who live healthy lifestyles cost more in the long run because they are more prone to get treatments, especially later in life. Their ideal customer is a lower class person who doesn’t pay attention, just gets sick and quietly dies.