(4) Which industries will be the breakthrough points for mass adoptions of bitcoin (blockchain)?
I suspect that the media will be the first industry for mass adoption because the media at the moment is ready and waiting for any positive insightful news. Also, they (the media) realize the possibilities that are with digital currency investment. They are also the first point for communication to the public plus the trust repose on them.
Good point. I am sure it is helpful in spreading the use cases. Also I know some projects are connect original content creator with payment system, like AC3.