Breathability would definitely be an issue unless only used in the baffles, as others have said, but at that point the weight/cost savings wouldn't be substantial enough, IMO.
The potential for higher fill power is intriguing, but judging from the quilts Enlightened Equipment stocks "of the shelf" - i.e. quilts that were returned in new condition - most customers want 850FP anyway. They offer up to 950 (and at a significant cost increase) for those who absolutely need the lightest gear (I considered this but couldn't justify another ~$80). Plus from what I've read, fill powers above 850 have negligible lofting advantages as the extreme lab conditions used in US ratings cannot be replicated in the field.
I think there is potential for them to develop and offer more advanced and lighter fabrics in the future for a "premium" line, sort of along the lines of larger companies like Outdoor Research who have proprietary fabrics in their ultralight clothing.
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