You still can get damages in heart, kidney and lungs from corona, even if you are asymptomatic and didn't feel anything. The first cases were reported from italian divers you can't work in their job anymore because of lung damages.

And the costs wouldn't really get lower, you just change the illness. If you are healthier, you live longer and your final illness most probably will be cancer. Expensive long te treatment. Obese people die faster and cheaper.