HBO has led the way in making some of the highest quality television of the last 20 years. Competition has gotten stiffer, but I still view HBO as the premier place for TV (Sopranos, The Wire, Sex and the City, Curb, Veep, Leftovers, True Detective, Deadwood... and of course GoT, the list goes on and on). I would argue many of our favorite broadcast/cable shows would simply not exist if HBO hadn't gone there first.
They've had some duds, and certainly have a lot of small-audience niche TV, but for the most part it's a premium quality that I'm willing to pay for.
I'm reading through the lines a bit and here is what I see in the article:
"More content, faster, cheaper."
This isn't about an outdated streaming strategy, HBO Go/Now are fine.
If they race to compete with Netflix (dropping price, increasing output), who is quite literally shitting out content every day, the overall quality of HBO will decline greatly. Netflix started with premiere TV (House of Cards) but has evolved into a massive mess of content, rarely of which any really captures my attention anymore.
Unfortunately, as the money machine needs to be fed, I 100% see HBO slowly turning into a content factory, and quality is going to fall off.
I hope in 3-5 years to come back to this comment and laugh at how wrong I was, but I feel pretty certain about an upcoming quality drop from what was once the bellwether of high quality entertainment.