There are already streaming services on the Switch like Hulu in the US and NicoNico in Japan. But the biggest of them, Netflix, still hasn't launched. A user decided to ask Netflix about this on Twitter and got the following response: "There are currently no plans for Netflix on Nintendo Switch. We appreciate your feedback on it!"
Of course, this doesn't mean we'll never get it, but judging by the sounds of it we shouldn't expect it to change soon. Would you use Netflix if it was available on Nintendo Switch?