Here's the question though: should I plan to actually code an app, or should I just go for HTML5? What would you do?
The livestreaming tech isn't hard. (If you check out my profile, there is an email there which will forward to my work account, we do that sort of work there, so my advice is not completely unselfishly motivated) and it does adjust pretty well between different network conditions.
I'm not an HTML5 expert though, so can't really offer you a contrast.
But, if you have the resources, you might as well have an app. Think of the App Store as free advertising.