I don't see how this is bad news. The better humanity does at treating acute crises, the smaller a share of deaths they will account for; but the overall death

I don't see how this is bad news. The better humanity does at treating acute crises, the smaller a share of deaths they will account for; but the overall death rate must remain fixed at 100%, so other causes will naturally increase by equal proportion. The best situation we could possibly hope for would be chronic diseases causing 100% of all deaths globally, as a function of old age!