Well, Mark Suster and Justin Kan are just two examples of gorwnups using Snapchat successfully for video blogging.

They're using it as a business, not what the other 99.9% of people are using it for.

There's a chance then that more people will be using it for that purpose targeting wider audience.

Sure, but the point here is, that is relies on a young user base. They are widely known as having zero loyalty, and will drop and move on to the next big thing on a whim.