You might see banks (if they haven't already) start lowering limits, cancelling cards, increasing rates and potentially screening customers harder (since right now they send card approvals to deceased people, children and people's pets from time to time LOL).
I'd expect porn sites who don't have alternative billing or mostly rely on credit card sales to see hits from this the most. People who lose their cards or have their limit lowered down will be unable to purchase porn with it even when they might still want to
