It is perhaps a bit of a contradiction, in the sense that restaurant owners have expressed fear that there will be an impact on their revenues. The evidence I've seen doesn't support that. Of course, the evidence is partial, so it's possible that some types of restaurants will be affected and not those that were studied, but there doesn't appear to be strong support for that fear.
Rather than affecting overall revenue, it will likely shift it to different types of products. That's what the studies I have seen suggest.