There's nowhere they can go and nothing they can do, without dipping into some REALLY shady partners that would probably fold before long anyway. "High risk" processors don't help: they exist to handle chargebacks, not to avoid CCCs decrees from on high. If the grand gods of banking throw you out, there are no alternatives for a law-abiding person. Itch, like Steam is in the spotlight now, which makes them radioactive. No one will go anywhere near them. Which was exactly the intention of the scumbags that did this.
The only glimmer of hope is that people have the memory of goldfish, especially these days. Given enough time, that spotlight may fade. But that does nothing to undo the damage that's already been done.