The thing is, open gate is a pretty big deal for people in charge of social media for companies big and small. Almost everyone i know doing that kind of work is a Sony shooter and are frustrated that they don't have that option, while my S5II X does.
I know of at least three folks who switched to Lumix for open gate, though that's a drop in the bucket. Still, as other companies introduce it, Sony might find themselves shedding customers if they too don't introduce it soon.