I think thats a little to B&W. I don't think you should only ever have a video, Its important to have features in writing. You never know when you need to print something out for your boss to review.

My big point is, let people trust in and rely on a video as their first experience, make that experience priority, if it makes sense for your business.

ECM and Zumbox both offer very new strategies to dealing with a problem most people don't really conceptualize immediately.