If anything, I'd say the more options the better, so giving the people a slightly more expensive option equipped with a BD would be a more viable options IMO for the audience the cheaper SKU potentially targets, especially in US and its data caps, whereas in EU the cheaper, 299 digital-only model might be a great competition for anything Sony will have to offer from a pure price point perspective. And same goes for the XBX as well, why not release a BD-less model for less, for people who prefer digital distribution? So that would give a total of 4 SKUs (INB4 "OMG, I can easily differentiate 20 smartphones from the same manufacturer but 4 consoles?!? That's too much for me!!"), something like:
299 XB SAD
399 XB S
499 XB XAD
599 XB X
Everything for everyone.