For non exam years tbh I can't see that missing a couple of weeks of school in a year will negatively affect the vast majority of children's long term education.
I have been a secondary school teacher for many years, and now a HLTA in primary. My experience is that most children don't suffer from a family holiday in term time. And tbh, it doesn't make that much difference to the teachers either.
And for some families, they don't have the option of non term time holidays due to set holidays in their work places. How will these be accommodated?
And what about family events in term time - weddings, baptisms, funerals, ill relative abroad, etc?