My DD1 won't start until she is 5.5 either. I don't love the idea, but mostly because I think she be more than ready by then and will be chomping at the bit to start kindy waaaay before she is 4.5! But other than that fact I don't have a huge issue with it, there will be lots of kids in the same boat and it will be the new normal. My preference would be for more than 2 terms of reception for the reasons other have stated (getting used to routines, social aspects etc.) so this is the way it has to be!