Not trying to be discouraging, but my fear would be that your product is just a feature that other video editing software products will add if it is popular. Have you thought about your endgame? It is a good idea though -- I'm surprised they don't already do that.
Yeah, that's something I've considered. I'm surprised they don't yet too. Even though it might be a short term opportunity, it feels worth pursuing for now because it's a tool that can save me and others a good chunk of time.
My other line of thinking is that this could expand into an editor that's purpose-built for screencasters, with whatever other niche features that might entail.