There is certainly an inherent efficiency in centralization, economy of scale in resource costs both physical and human. But even the large players have to dis

There is certainly an inherent efficiency in centralization, economy of scale in resource costs both physical and human. But even the large players have to distribute their data centers - there's a geographical limit at which you must decentralize again anyway. So the key here is to decentralize at the proper scale - large enough nodes to be cost effective, widely enough distributed to prevent SPOF and provide good response times. I'm pretty sure this can be done at a level smaller than where the Google/Yahoo/Microsofts of the world operate.