Are Open Standards Bad for Encryption?

An Anonymous Coward asks: "Open standards for most things are good -- they keep the big fish from closing the pond. For encryption, though, open standards make things easier to break. What will happen to computer security when someone finds a way to factor very large numbers? Every implementation on every computer will suddenly be obsolete. How would that effect the much heralded 'new economy' and how quickly would the encryption industry be able to reestablish a standard?"