You have to keep in mind that your home internet may get more expensive of you decide to dump your packaged TV.
Also - when I was looking into this, I called DirecTV to inquire about canceling... They lowered my bill DRAMATICALLY. I now pay $50/mo for internet and TV, total, for the next ten months. About $70 less than before, and I lost nothing.
The streaming services are putting a big squeeze on the traditional providers. If you call prepared to cancel and tell them that you're going to a streaming service (and especially if you tell them you're switching to another internet provider too) they might make you a heck of an offer.