well, something like this can't be fixed overnight. I think Valve have more than earned a benefit of the doubt with this kind of stuff. I don't know if they are thinking on ways around this issue or not, but I would bet highly that they are. Problem is the credit card companies have them (and everyone else) by the balls because any attempt to continue hosting those gmaes but accept alternative payments for them would be retaliated against and MC et al might cut them off entirely, which would be devastating. I'm not sure there is a good solution to this that doesn't involve change of law/regulation i.e. lobbying

In the early 2000's kink.com put together a coalition and told the credit card companies to stick their censorship rules where the sun don't shine, and they are still taking credit card payments... The video game industry is plenty big enough to wield similar influence.