The issue here is rights.
The rights to this content are very tightly controlled, it's very expensive, and contracts are allocated usually in the billions.
It would take a startup literally with billions to 'out bid' some entity for right to a sport, and then make it available.
FYI - if you subscribe to ESPN etc. for cable, I believe they actually do have streaming available, but since I'm in Canada, I can't say for sure.
It's not a technology issue, it's a value-chain issue.
A lot of entertainment markets are kind of screwed up because of this - and how arcane some of the systems are.
there's even news of a crackdown going on in the uk with people who are selling modded boxes http://www.mirror.co.uk/news/uk-news/kodi-illegal-first-man-...
A lot of the 10ft apps available on e.g. Amazon Fire TV etc fall short here too - I don't want to keep selecting the next 3 min clip, just instantly play me a curated stream.
Mark Cuban had good thoughts on TV vs VOD many years ago e.g. http://blogmaverick.com/2010/10/26/the-value-of-your-time-an...
The issue is not technical, its the usual problem with audio/video content and vested interests - regional locks, contracts, existing cash cows etc etc. Tough for a startup to negotiate deals against Eddy Cue, I see the solution coming from the big tech Cos...
A curated "channel-like" experience for Netflix/YouTube shows. There's a LOT of good content out there, but it's hard to filter. And the "channel" experience of surfing and switching between programs has been kind of lost.
A different kind of smartphone, with actual buttons. Or maybe even what one manufacturer (Samsung?) tried to do, splitting the phone experience from the smart experience, with one ergonomically good device for calls, and another for messages and browsing. I also very often want to be looking at my screen while on a call (check mail, google stuff, look at maps).
I also miss the experience of the slide-to-answer on my old Nokia n86, or flip-to-answer like the Motorola Razr. I could also make calls without looking.