I still think that a lot of the angst about this isn't actually to do with girls being distraught and having offers they really wanted to accept whipped out from under their noses, but parental annoyance at the seeming arrogance of a school denying them what they think is their right to have lots of time to choose.
Here we are, a couple of weeks after offers day and already, lots of people have moved on significantly from where they were a couple of weeks ago....in light of the offers they have. Parents and children adjust quickly, especially when they weren't dead set on a school and most of those who were dead set, accepted a place anyway. Although people say they need more time to choose, in reality, most people know where they will accept. If they are forced to do it speedily, then most can do that, but if they are given longer to accept, many will take longer to get the paperwork in....not because there is loads more to think about, but because it's human nature to do so and because lots of parents find it hard to let go of the offers from other great schools and accept that after a long old process of uncertainty and keeping ones options open, it's finally over and sorted. Lots of people would love to hold loads of offers and avoid committing finally for as long as possible.
So those who had a City offer explode have now mostly moved on mentally - that's children and parents. Most of them were never going to take City anyway, but go to one of the other great schools that is probably nearer to where they live. Some of these have accepted their offers and others won't do so until the final deadline, because they can't bring themselves to the finality of it. Most could make a choice today if pushed. Most will be happy with their choice when they make it and in the years to come when their child is at the given school, most are happy. I believe that the angst people talk about for the children and the unfairness for the children is much exaggerated. Some children have very clear ideas on their preference and voice it to parents, but many, rightly choose to leave the final choice to their parents and especially if applying to lots of schools, barely know or can remember the difference between them. Yes, they are excited by results day and everyone likes to have a number of offers. Usually there is a sense already if what the top option might be and if an offer from somewhere else explodes, it might be a bit surprising, but for the majority who were never going to accept it anyway, it doesn't fill their thoughts for lomg. The people it seems to fill the thoughts of are parents who feel annoyed on principal rather than practicality, in my view....and whilst I understand the approach is unpopular, I think that the school have simply made a rational decision given their location making over offering without explosion to control intake for their severely restricted site, whilst facing the problem of so many applying without it being their top choice due to geographical location.
I agree that things will probably be different next year. The school won't want people camping out and I'm sure they will avoid this. The fact that offers exploded early last year, that this year they offered less and they still exploded far sooner does show the uncertain tules and lack of info the school have when offering. I don't see this as a failure to do their homework beforehand, but simply a function of the fact that huge huge numbers apply and whilst there are more than enough who are both good enough and will choose City first, there are far more others who will accept an alternative offer....and City simply cannot know which are which.
It might be possible to impose a much tighter deadline of just a few days and then go to wait list. This would however be difficult because schools have an agreement about deadlines and can't really unleash a system where they all do their own thing regarding this - the competition which would ensue to get candidates would be far more unseemly than just exploding offers. City have officially kept the same deadline as the other schools, but their exploding offers is a way of both sticking to the letter of the law and manipulating it at the same time. Finding a new agreement for these schools about admissions would be hard to achieve. Self interest would be strong. The current system goes back a lomg way and has broadly worked, although better for some schools than for others and probably for all, works less well in this age of multiple applications and uncertainty about who will accept offers - more of a problem in some areas than others, according to just how many schools are in that area, how many schools of a similar type and locational flexibility to run bulge classes.
Perhaps schools will go for a shorter deadline overall so they have more info sooner. All difficult when there are state school offers to consider too - again more of an issue for some schools than others A some will lose very many good candidates to state grammars, but others very few. It will be interesting to see what transpires.
What is certain, is that schools will continue to look to their futures and to take actions to prioritise those. Top, academic schools live and die based on having the right number of students and having those of high enough ability to make the school financially viable and to deliver the results that parents expect. Admsissions is all about doing that in reality. Part of this process is turning down many at different stages of the applications process, and this will have to continue to happen in one form or another.