I happen to be looking at a website of a videographer who was suggesting that the still images taken from his video could substitute for hiring a professional wedding photographer. It is to laugh! That would be the equivalent of using a 3 mega-pixel camera. My wife’s camera has better resolution than that!
Now, there is a lot more to photography than the megapixel size of your camera. There is exposure, focus, compostion and lighting. I’ve seen very few videographers who understand and apply all four of those fundamentals. Granted, the videographer does have the advantage of not having to ‘time’ when he takes the photograph. However, the lack of resolution and lack of light control, composition and posing would make this scenario no better than what your friends are taking with their point-and-shoot cameras.