It's coming we are just not there yet. Most people want convenience more than anything, and not having to search all over trying to figure out which steaming service is offering the game, and do they have that service. They want to go over to their tv, turn it on and find the game. How they get it, over the air, through satellite or streaming does not matter, they what it all together in one place and easy to find.
We stream everything, and I will admit, it's a pain sometimes finding which service will be showing the game. Before we had everything through DirectTV, and could easily find and watch 90% of the games. Now it's all over the place and the average sports fan just says "screw it" and watches a different game.