You can't modify smart contract code once it's been deployed, period. Ether that's locked up in bugged out contracts is permanently lost.

This post describes a strategy for writing contracts that proxies the actual implementation of the contract to another contract. If the contract needs to be modified, a new contract is deployed and the original contract is set to point to the new contract.

Edit: I misread your comment. There has been a discussion over of a possible hard fork in order to recover lost funds, but that's not what the author is referring to in this post.