Because of the extreme success of Daredevil, Netflix is working with Disney on the cheap and more than happy to continue their relationship. For Lucasfilm this makes a lot of sense, as they want to keep the cinematic feel of the movies going with the TV shows. Netflix allows for such a presentation much better than network television, while also giving them a chance to explore stories and characters which otherwise might not be a good fit somewhere else.
While initial rumors surrounding Star Wars on TV pegged ABC or another Disney owned channel as being the likeliest spot for a series (like Agents of SHIELD), that doesn't seem to be the case anymore. Let's look at the facts, Netflix and other online options are quickly overtaking regular TV. This year's Emmy nominations are absolutely PACKED with shows from non-traditional sources and in terms of revenue, Netflix is set to overtake network TV very shortly. It's the way the world is moving and Disney is great at keeping with current trends.