Childcare, although helpful for those parents who cannot WFH, would seem to present a choice to those who can: either put your children into a riskier environment, or accept that you will be less productive than your colleagues who are willing to take that risk. That's a terrible choice for a parent to make. The safest method would be to permanently assign one child care professional to a family, to limit any transmission, but I doubt there are enough child care professionals to do that.