I think the conflict about whether or not nursery staff are uneduacted or not intelligent comes down to a change in expectations and opportunity over the past few years.
I left school ten years ago. Twelve years ago I remember saying to the career teacher that I wished I wasn't academic because I wanted to work in a nursery. Neither he nor I questioned the 'fact' that me happening to be academically bright precluded that career path. In my school nursery nursing was a college course taken by (mainly) girls who didn't get the GCSE grades to enter 6th form.
Nowadays it's all very different. One of my friends is deputy head of a very well regarded infant school. She has an undergrad and postgrad degree from a top university. What class does she teach - the nursery! The idea of her being seen as uneducated or 'thick' for teaching nursery is laughable.
However, I do think it's a terrible thing to suggest that people should have A Levels to teach in nursery. Nursery teaching is still one of the few fulfilling job options for those with no qualifications and I think it should remain so - you do not need to be intelligent to care for small children, you need personal qualities.
I don't think it's a case of 'nursery teachers should be highly qualified' or 'nursery teachers are thick', it should be 'nursery teachers are suitable people to care for children and their intelligence is irrelevant'.