Netflix is the first media company with the business model of "Give the customers exactly what they want."
My comment has nothing to do specifically with Netflix, but addresses a general pattern that is seen when there's a market leader.
When a "new guy" comes into an existing market, they can see what the leaders are doing and figure out better ways of doing the same thing. In this case, there's been reference to Netflix taking over from Blockbuster. That's because Blockbuster was one of the market leaders at that time.
So, why didn't Blockbuster continue on as leader? Because when one is leading, one doesn't have a model to emulate or follow... there isn't someone to "copy-then-do-better" because, frankly, you're the leader.
So, the leader spends a lot of time and money trying different things to figure out what the market wants. That diversity means money is spent in multiple directions... not just focused on "the one thing the market wants."
Nobody can guess correctly all the time. Eventually, competitors, who start up focused on "the one thing" start to eat away the leader's market. Eventually, that leader falls away, and a new leader (or couple of leaders) takes that spot.
Back to this topic... what will Netflix do next? They'll try and test/guess what the market will want, but won't know by watching other's. They'll either diversify too much (and lose core capability) or miss out on "the next big thing" and be racing to try and catch-up, likely too late.
That's 100% not a fault with Netflix. It is a challenge for any competitive market.