Smart contracts that can be modified post-hoc, through consensus or (after a precedent was made that it is possible) legislation or a judge are not smart.
Smart contracts are one-sided. The exploiter always wins if the contract writer made a stupid mistake.
WHY would you want that system?
Why would you need Ethereum if the contracts you want to enforce shouldn't be "smart"?
Sure, if the judges can use their power of personal persuasion to convince the dispersed population of anonymous miners/stakers that they should adopt the contract modification (as ethereum community leaders did during the DAOsaster) they will be able to enact changes.
Perhaps this is confusing enough to trick regulators, however I'm not so certain.