Yeah, but silent films weren’t without dialogue, it just had to be written instead of spoken. If you’ve ever seen a truly silent movie/video, one with very little or no dialogue (such as the Triplets of Belleville), you quickly see how surreal an atmosphere it creates. However, that effect comes from the fact that nobody speaks, so I’m not really sure what would happen if only one character was silent, but I suspect it might be kind of awkward. I haven’t seen Samurai Jack so correct me if I’m wrong, if it does work out ok.
As for a movie, I don’t really care if they make one or not as long as it isn’t badly made. If they don’t make one, nothing changes. If they do, Valve won’t let it suck. So I’m not really worried.