You can't repair ex post facto (or even now) the anonymity because you can't erase the block chain. If I am correct, it is already broken. Wasn't that the only feature of Monero?
I don't know why BCX didn't just threaten to do that instead and short XMR. No need to steal coins nor do a Time Warp.
If it's already broken, we have much bigger problems.
But don't worry there is only 4% chance of that. Ask rpietila, he is a prophet.