I think McCullum's been thoughtful there, remains to be seen how successful he can be in refining it. You can't just blast your way to a better form of cricket. You see it in all forms of sport.. the best defense wins championships in football, the better bowling/more technical batters win in test cricket.
I expected England to come undone in the Ashes, and Australia went 2-0, and for some reason it ended at par which was surprising for me. In the long run, I still think it won't work.
I think it works for a few players like Crawley and Duckett, but I think the rest of the team has to be built in its own way. Nor do I think it's easy to find someone of the calibre of Crawley. Stick Jason Roy in that and he's averaging 20, probably.
England need to dissociate themselves of this stupid tag and build a proper test team