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I think you’re not sufficiently taking into account the demographic trajectory of age distribution [0], and the lag induced by the length of the human lifespan on health improvements. For the next few decades, more doctors will be needed.

[0] https://www.calculatedriskblog.com/2013/08/us-population-dis...

While you're at it why not no crime so there's no police. Nothing dangerous so no firemen. Nobody throws anything away, so no need for factories. Peace on earth, so no soldiers.

We don't need firemen. Just don't start fires.

That is a good analogy. Let us consider that there is a growing number of fire events in the recent years. Instead of finding out what is causing it, and fixing it we are asking for more firemen....