I certainly think that access to a way through the security on the ECUs would be a good thing.
As Chris says, it's likely that MMC's hands are tied on this and even if they have the ability to get passed the locks they have kept it very tight and I'm pretty sure that if anything had made it out of the back door then we would be well aware of it by now.
I have absolutely no idea how much it might cost to crack the code, but am definitely interested.