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Since it's launch, GoGo has steadily been growing and adding more and more planes in North America with their airline partners. Their rollout has been actually smoother than the rollout of hotel broadband back in the late 90's and early 2000's. Those who were online back then will recall the what the experience was like. Inconsistent. Poor. Frustrating. It resulted in many guests who needed, and relied on broadband vs. dial-up, to actually choose the hotels they checked-in to based upon the broadband provider.
Back in that era, the take rate was initally under ten percent of rooms in use. That clearly has changed, and I would bet that the take rate for GoGo is actually outpacing the take rate for access in the air when compared to the first few years of hotel broadband. That's going to rise because of recently signed agreements by GoGo with iPass and Boingo. Both bring single sign on capabilty, but more importantly they also bring business customers and regular consumers who understand the value of staying connected.
On a recent flight on Virgin America GoGo was free. The service is working hard to make people aware of it's availability, and as someone who flies once a week or more, I choose my flights and airlines based upon the availability of WiFi. My guess is other business fliers do also.