They fly everywhere I do and ignore the FAA rule? Seriously?
Emirates have an amazing network, if you're happy to change once you can get from pretty much anywhere in the world to anywhere else. Nairobi to Berlin? Tokyo to Manchester? Sydney to Delhi?
Emirates couldn't give a stuff why the FAA say, just like delta couldn't care less about what the CAA says.
Light must bend when it passes your skull. So you are under the impression that the whole freaking universe flies Nairobi to Berlin? Tokyo to Manchester? Sydney to Delhi? Guess again Einstein, There is an entire world that does not share your San Francisco practicality. So here is another suggestion, let airlines provide the services that they want to provide and compete on that basis.
Err, those are examples. And EK do fly San Francisco to Dubai too, which allows connections to that part of the world.
I believe Virgin (UK), Ryanair (Ireland), Qantas (Austrailia) and Qatar (Qatar) all offer, or offered, in flight mobiles too, at least on some planes, and I know the last TAP (Portugal) flight I was on offered it. The fact others haven't tells me that the commercial demand just isn't there, but on the whole there's no global problem with carriers offering it.
No doubt you'll come up with some obscure example like "I want to fly from Hicksville to Bogata on a Star Alliance carrier and they don't offer it unless I choose a seat near the front but I prefer to be behind the wing as I get a better view".