Reflecting on the recent events involving the DAO, why isn't there a mechanism built into Ethereum to modify contract code? Unknown-unknowns are always in code. In my day-to-day dealings with product features I always assume I'll need to patch existing code already running in production, and I build my environment upon the axiom that I'll need to change things <i>as</i> I hit edge cases.<p>It's almost as if Ethereum requires us to use the waterfall approach to design and implementation contracts, which just will not fly in the world of software.<p>I'm sure I'm not the first to think of this, so is there any work being done in this area? Have people been working on, maybe, a multi-sig scheme where contract code can be modified in a secure and agreed upon ways?