Admittedly the porn payments are going to raise awareness for those who want a certain level of anonymity.
But real mainstream acceptance, in my opinion is going to be with more mundane and everyday things. Avoiding currency conversion costs could be a major incentive.
I flee to warmer climes, and transaction costs across borders in fiat kill me. I try to get everyone to accept bitcoin for major purchases and if they did, it would make my wintering abroad so much better. Tourism is exactly 'the mundane way to reduce transaction costs' because a foreign currency zone is exactly where bitcoin can shine most in reducting transaction costs.