I’m no virologist, but the number of people I’ve seen say Covid will become mild ‘like other coronaviruses’?…

I’m no virologist, but the number of people I’ve seen say Covid will become mild ‘like other coronaviruses’? Aren’t Sars-Cov-1 and MERS an easy counter to that? Like any virus family, there seem a whole range of virulence outcomes that are possible in the longer term.