No double income.
Single income families would result in higher singular income.
Also, this wouldn’t necessarily result in all kids staying home. How many jobs could be adapted so your children work beside you as you worked?
There are lots of home-based business options now - whether Etsy or Shopify or (👎🏻Amazon)...it does takes some work and marketing skill, but it can supplement a single income, and also give a creative/personal satisfaction outlet to a parent who decides to give up a job to home school.