Though I agree a service could definitely come about to handle millions of concurrent viewers (I wouldn't be surprised if Youtube could/almost could handle it),

Though I agree a service could definitely come about to handle millions of concurrent viewers (I wouldn't be surprised if Youtube could/almost could handle it), I just want to point out those 14.7 million concurrent viewers were across all services. So not one service handling it all. Twitch, Youtube, Korea's Twitch (forget the name), and I believe China has a few major streaming companies.