Remember that VISA/MC USA have already pulled out of casino transactions - this might not be the whole truth, but interesting because it was written by casino folks -
http://www.gambletribune.org/article758.html
Shows that when possible legal problems outweigh the income potential, then any banker will close his deals. They are not here to fight for our rights, they are here to make money
VISA/MC will probably not stop adult on a world wide scale, however lawsuits like this, and other issues on the horizon will limit the number of acquiring banks, driving up costs and making business even more risky
However with all this said, then we better get used to this scenario - where everyone gets sued, because this is how lawyers and prosecution will work internet cases until someone in the system tells them to "stop, wasting our time"
Anyone think that lawyers is the best thing for moving forward in any industry are only setting themself up to be sued by someone else once they reach the top of the food chain - this is where lawyers pick their next victims