People saying that this is a good thing because they save on server cost. You are right about that part. But the problem is that the search snippet with wiki powered data is a Google Product.
When users consume this data, they become Google customers, not Wikipedia users. Even my little website has seen a 30% drop in traffic, but I appear in much more snippets. Those users get their information and never visit my blog at all. This creates loyal google users [1], not loyal < insert blog/business name here> followers