I do get what you are trying to say, and I do question why they bother. People who tune into the news, usually tune into one particular service e.g. 9 News, not just the one bulletin. So I do get what you are saying, maybe they could axe the current existing model, and focus on maybe one bulletin focused on the youth that doesn't require you to watch multiple bulletins. I hope this makes sense.
But I really hope they don't resort to this, and I hope we see expansion. Remember TEN are launching an online News portal/site called Ten Daily. So who knows, we might see online bulletins. But I haven't heard much about Ten Daily yet.