Im not doing a video drama, but i think that if you can create a film, and stir emotions in your audience without words, it has a greater impact on your audience and a better image of you as a director.
I was having heaps of dialouge, but then i saw the onstage videos, which were wordless, and thus i've changed tack. its a shame though. i think the markers are pushing people away from using words...... i like words. Damn.