If you want to buy, say furniture, a big barrier of web shopping is that you cannot automatically reason about their dimensions, because they are not exact enough (and even more seriously, they are usually available only as free text).

The 3D scanning technology would enable products that are add-ons to objects where the original manufacturer did not see value in adding an interface. If I can scan my car interior, I can attach my GPS to nearly any surface "perfectly". This gives aftermarket products very nice finish with a much lower cost.