I don't think HE is the best option for every child or every family. Nor do I think it is the only option. But it is a legal option, and I think far more of us should at least consider it seriously with our children, get ourselves informed and think about the pros and cons.
At school-choosing time, it'd be "this CofE primary, or the one round the corner which we are in the catchment for, or do we feel like a Steiner-WAldorf, or are we going to be sending our children to a very posh prep school or can we get into this RC primary, or shall we home educate?" Just one on the list.
it simply isn't seen as an option by many families, and they don't offer it as a possibility to their children even if their children are clearly unhappy about starting/continuing school. I think they should, because happy children learn better and live better than unhappy ones.