While I agree with you that the content of the last few releases have been fascinating but mostly inconsequential. The reason given for staggering the releases is a good one: if you released it all at the same time, each individual issue would not get as much attention. Assange also states that Wikileaks makes a promise (among other promises such as to protect their identity) to its informants to try to achieve the maximum possible impact on the world due to their leak.