That is all well and good but again part of why Blizzard is updating character models is to make them all more consistent with each other. Putting them in the cash shop runs counter to that as it would result in a mish mash of wildly different looking models making the game overall look worse than it did before the update. It just isn't going to happen. Now that isn't to say they won't put some additional options for the new character models in the cash shop which I think is likely but the actual updated models themselves will be free.
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And mods need to start banning for this nonsense. The industry has changed and Blizzard has to change with it or get left behind. That is all there is to it.