"Next time", I and many others will simply refuse the lockdown strategy, and if it so happens that it's a virus that has high lethality across all age groups, loads of us are going to die before the evidence is clear and we start to voluntarily reduce interactions.
"Just a few weeks to flatten the curve" was a once in a generational play. I did my bit, and so far I've been punished for it.
I really hope for our sake it doesn't come down to this again, because this time it really will be a bloodbath, rather than a particularly bad year or two.