The article briefly mentions original content like it was their last smart move and they'll have to do something else to survive. I would disagree with that assessment.
The media cartels (MPAA etc) are trying to starve out Netflix by jacking up their licensing fees, onerous international distribution agreements, etc etc.
The Netflix back catalog of old movies has actually been shrinking. The focus on original content is to bring control to their programming so that they aren't 100% at the mercy of the cartels who want nothing more than for Netflix to die. The goal of the cartels is that Hulu or some other godforsaken corp-owned property can retain their dominance of the public eyeball.
That's why Netflix has gone all in on their original programming. I just finished watching Stranger Things and it is really good. Because Netflix developed it themselves, they don't have to negotiate an international distribution agreement and they can release it simultaneously in all the markets they offer subscriptions. That's huge. I watched past the credits and there were translation teams for about 8 languages - I think I saw French, Spanish, Japanese, German among them.
So I think their play is what they are already doing - pour money into original programming, build their own back catalog so they aren't at the mercy of greedy content providers, and keep providing great customer service.