>>Mutations will tend to become less serious
I gather that's a general rule but it might depend where you start from. The serious case and death rate isn't really material in affecting its propagation now. Smallpox propagated quite well despite a 30% mortality rate until vaccination got on top of it.
I saw some stats recently that I have not seen published in the form they were presented although the information is all in the public domain. Although, notoriously, older people are at much higher risk, essentially for all adults over 25 the increased risk of death from Covid is proportionately much the same as the increase in risk of death from all causes in all age bands.
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