Why not suggest to your husband that you try it for a year and then re-evaluate? Worst case he goes back to school after a year and best case he thrives and stays home. You can assure him that you will join a home school group and certain sports/cultural/play clubs too. (There is cubs also that offers great social interaction)

This is what I had to do initially to get my husband on board.

(Then he suggested we give the school "one more go". Then when our child was broken and needed therapy husband was the one that insisted we take him out and reminded me of the way I suggested it at the beginning!)

Mom to 3 gorgeous boys: Aiden (8), Nathan (7) and Dylan (4)