I agree, I'm not in favour of IB. I don't think it offers the subject depth for those that want to study say science or medicine.
I wonder if they have actually done some market research amongst the current parents.
Interestingly the girls school (KEHS), where my daughter is offering IB, but only as a supplement to A Levels. The view is that this probably isn't too difficult to achieve given the level of extra curricula activities that most girls undertake.
I am sick as a parrot because I asked the last Chief Master if he would consider introducing it as AS levels and A levels are now so tedious and uninspiring, and he said no. And now my son is embarked on AS levels and it is too late. IB is far superior in my view.