This notion suggests that the right place to start the kind of big-data medical disruption that could work would be a nation with a weaker or nonexistent medical insurance framework.
Just cause I'm feeling particularly paranoid today.
I'd prefer to retain my privacy and take my chances on the medical miscommunication front, thanks.
Once there is a single large integrated database it's a HUGE target for people to creatively re-interpret the rules such that they can sell access to it. It's also a hacking target too since doctors tend to be a real pain in the ass about collecting all kinds of information that's not medically necessary but perhaps necessary for billing or in case you try not to pay your bill.
Right now this information is federated meaning that there's no one single point of failure. Hospital X's systems might go down, but Hospital Y's systems are still up. That means that unless something REALLY BAD happens across all the hospitals you're not going to die because a computer crashes.
I am far more on-board with good interchange protocols (Diaspora) than with one large centrally managed database (Facebook).
And how common, as a ratio, are crippling medical screwups related to multi-practice miscommunication? I'm sure the absolute number is non-zero, but risks must be weighed. If one person having a crippling issue saves 100,000 people from having their personal data released against their will...
Crippling medical screwups that could have been prevented by having the right information available at the right time are actually shockingly common. I don't remember the specifics, but I've seen claims to the effect of a five digit annual death toll in the US alone.