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It's a proprietary system that requires no new frame standards. There are currently multiple spindle sizes on the market and they don't all play nicely together - not all 24mm spindles are alike and there are also 30mm spindles (that don't work acceptably with PF92 BBs) and smaller ones going backwards. There are multiple sizes already so there is no standard BB spindle size. For something to be a 'new standard' doesn't it need to be replacing something that has a standard - like 135mm axles or 1 1/8 straight steerers?
I'd argue that bars/stem are slightly different because stems don't need to be replaced generally so you wouldn't replace your stem every time you replace your bar while you would almost certainly replace your BB if you are replacing your cranks.
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