I suspect that, in retrospect, the first inclination of many parents when the pandemic began to hold "COVID parties" for children like the familiar "chicken pox parties"—inclination that wasn't followed, because of dire warnings about long-term health effects—was the right one.
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Fairly definitively that was always the wrong answer.
In the future:
1. Most people will get SARS-CoV-2 antibodies from their mothers
2. Early life exposure will happen
3. The SARS-CoV-2 virus will be force to make expensive mutations to avoid immune escape will come at a cost to fitness.
None of the conditions can be created by what you suggest. You have the problem of having the relatively most-lethal / most-transmissible version of the virus spreading unhindered in a population of >40 year olds who have no natural immunity. The "COVID party" solution maximizes the death and cost of the virus.