They can wipe the game and reimburse Zen to the accounts that bought it with cash. I doubt they don't keep records of who paid and such per account. Wipe it out and reimburse Zen get rid of the ill gotten gains.
You have a record of everyone who bought zen online for the game just wipe the servers and reimburse the zen that was paid for with RL cash to the accounts. I don't care about starting over just don't want the cash I spent to be wasted!. I'll just start again with a bunch of Zen and others who cheated will have nothing.