If I'm not mistaken, doesn't the NBA have its own TV network called NBA TV?

I'm pretty sure they aren't making as much money as they want, though. If they make some deal out of Youtube, it would be win-win. Plus, another win for users (as long as it's free or cost at a decent price).

I'm so ready to cancel my cable tv.

They do. And NBA TV Canada.

Not to mention they also have League Pass and League Pass Broadband which streams every game.