Did Google change/eliminate rich snippets for videos?
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For example, if you search "Whiteboard Friday" on Google, the only rich snippets are for YouTube videos. None of the rich snippets point to Moz.com directly
This contradicts this video from Wistia about video SEO - http://wistia.com/learning/video-seo
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Yes, for the time being Youtube will be the prevailing video result. Since this is a recent change, I would imagine some of the information in the Wistia library is a little out of date. They more than likely aren't trying to mislead you.
Wistia still makes sense for a number of use cases.
Phil Nottingham of Distilled wrote a Moz Post you will find interesting.