Every time Apple ditches legacy ports and peripherals, there's wailing and gnashing of teeth, but after a while, consumers come around. It's all about adaption. In any case, it's not the replacement for the Air or the MBP. It's an experiment to make the Mac more like an iPad. And I thought the Air was already pretty iPad-ish. It's nothing short of a rethink of the Ultrabook style computer: hyper-portable, cloud and wireless everything, legacy-free.