Yeah, shopping would be a great feature. It's something I've used fairly often on Google to get another perspective to compare to the websites I would usually use. Most of the time it is trash though.
It could also be an avenue to offset some of the cost of search. I think it's one of the few places where advertisements, if done tactfully, could be non-intrusive and improve user experience a little. Non-targeted, non-tracking, clearly marked and related to the search. Though I imagine most users would disagree on this point