I don't see Amazon doing much as far as cultural changes. Twitch was largely left untouched and continues to operate as before. This was a strategic purchase so Amazon. They want you to go to Amazon for everything and a popular nation-wide grocery chain is exactly what they needed.

What you will see is a relationship between Amazon Prime and WF. But, as with the case with Twitch, it will be Amazon that deals with that and WF will likely continue to do its thing while Amazon generates MORE customer loyalty and a new customer base.