The wikidata page is similarly stamped:
"All structured data from the main and property namespace is available under the Creative Commons CC0 License; text in the other namespaces is available under the Creative Commons Attribution-ShareAlike License; additional terms may apply.", which links to http://creativecommons.org/pub... and the CC BY-SA 3.0 license.
And CC0 is no copyleft license. "text in the other namespaces" is only a small minority of wikidata's data.
So, there you go. WP doesn't suffer. The appearance of Wikipedia data in Google's Knowledge Panels furthers WP's goals.
Now google decides what appears in the info box. Also, the image is chosen by google, and all other data than the short description also come from some google database. So while wikipedia is still prominent, its position is weakened.