I doubt DC's streaming service lasts long, unless the price stays around the $3 a month range.
There's limit on how many "exclusive" streaming services people will keep. Netflix was the first and still the biggest (I think?), and Amazon comes with all the other Amazon perks (like 2-day shipping). HBO Go is doing fine, but I bet there'll be a steep drop in subscribers when GoT is over.
DC just doesn't have much to offer, unless they bundle it with some digital comic access. Then it might tempt me, but I prefer my comics to be tangible.
That's an interesting idea. I've also wondered how they come up with enough content to justify the cost. Clearly it won't be tons of new programming right out of the gate. Will they make previous DC animated series available? Previous films? I'm onboard I think as long as Titans is a level up (or more comic faithful) from/than, say, the CW DC shows.