Origamist,
All my colleagues at work are very aware of my videos and what I do. However, I have managed to encourage (over the last 6 months) 4 to take up cycling to work. In my experience (and cab highlighted this in another thread) people prefer to be forewarned of the dangers, and thus be able to compensate for them.
In fact, I would suggest that without seeing my videos people think cycling is dangerous and crazy anyway. In all of my videos and especially in what I write about them, I always try to stress
a) that the incidents are rare (approx 3% of my commutes)

that by riding correctly you almost always will have an escape route
c) I would much prefer to cycle than to drive
As well as this, getting more cyclists on the roads isn't just about numbers. I think if we can increase the number of 'good' cyclists on the road, that is where we will see a difference. More good cyclists on the road would mean traffic would generally be a bit slower and smoother. The roads would be safer and more people would take up cycling. So maybe by viewing my videos and what I say about them, I will (maybe) encourage some new cyclists to think about safety, and not just to get on the road and see what happens.
I've had many, many comments good and bad about my videos, but I've never heard anyone suggest that, upon seeing my videos, they have decided against cycling. Quite the opposite!