If the wikiwand interfacial elements were to be available locally, then the only thing you would have to fetch from the internet would be the wikipedia content. This would improve loading times as well as reduce traffic to your website every time an article is loaded. This can be bundled along with the extension, which would do more than redirection now.

I got the idea from the Mega (ala the Kim Dotcom service) extension and any typical android app, both of which generally have the interface available locally and only load content from out there.