Proposal: Big Data is not reasonably scoped
While I like the idea of having a community centered around Big Data I believe this is not a good fit to the StackExchange model in its current state and its scope needs to be refined.
People seem to talk about Big Data like a buzzword today and from the description of who this site is intended to, I believe that the scope is just "everything related to big-data". You can't just expect to have a community of experts on something so vague and so broad, and the risk of fragmentation of the community when/if the site is created is just too high. Mentioning statistics on top of that is just not reasonable, statistics is not necessarily tied to big data, and this only makes the scope even more fuzzy.
There is already a bigdata tag on SO and I don't see what this site would bring that could not be found on SO in this case.
In my opinion, instead of having such a huge site which in the end will just become a cluster of sub-communities and fail, there should be separate sites with better granularity.