My DS is 13 and AIUI that's the largest birth year and then there is a decline.
DD is 10 and almost everyone got their first place choice of secondary school in her year. Her school is advertising that their Reception is not full (DS was allocated another school and then got in on the waiting list).
So what happens when the number of pupils dips further? The primary school has got a nursery and baby unit, but it's got one classroom per class and it can't really close partially - it's two form entry - what happens to schools that eventually have a full class fewer?
A secondary school has closed locally and there are probably village primaries that will close but if this big town centre school has spaces eventually some schools will lose a whole class full, won't they?