I think there might be a need to several sidechains in the future. Right now we have just one reward payout system, but to fully capture all potential, we might need many of them. In my post What is the ten year vision for Steem blockchain? I was thinking about three chains:
- Fresh content. Twitter-like short messages, memes, breaking news. If content is older than 24 hours, very few are interested in it anymore.
- Blog-like content. Essays, opinions, commentary, etc. Stays relevant from a few days to a few months.
- Book-like content. Long texts. Stays relevant for years.
Live streaming goes to the first category.