Dirty web video secret: If you can see it, you can steal it
wistia.com
wistia.com
Or is it generally believed that images are of less "value" than video?
To get an image you don't even need to do anything vaguely hacky like Ctrl-U: you can just take a screenshot of your desktop. Pop open your favourite image editor and crop it: job done.
The best way to protect images on the web is to a) watermark them b) have them in low res.
But the general point is: if it renders to your screen it can be copied.
Any good player framework will likely account for this, hopefully by allowing all the same DOM-ey calls that one could perform with HTML5-ey video to be performed on flash through some sort of wrapper.
I don't think that content companies will just let it happen.