The true nature and strategy of Google Base is still a bit unclear for anyone outside of Google. It's potential is huge, but Marc Canter is asking the right question. Although he uses 'people profiles' as an example, it's the same for all other categories.
"What’s especially exciting to me are ‘people profiles’. The question is: “will this data be available in FOAF or XFN/hCard?” And will it be available at all? There’s a problem with Google Base that needs to get resolved - immediately. We’ve been waiting patiently while Google expands the service - but we still don’t know whether or not all this data is for Google’s exclusive use - or whether this structured data will be available publicly or not."