PodCamp Hawaii is doing just that, they're dedicated one track through both days to Wordpress. I don't want to make ours Wordpess only, many people use other blogging apps such as Blogger, MovaableType, Habari, TypePad, LiveJournal, etc... I wouldn't necessarily think we would want it to be Wordpress only track for sure.
Other podcamps didn't have the problem ours had, having a majority of the sessions geared to podcasting only. We did have sessions that appealed to bloggers, but Ohio area bloggers in general I don't think saw the connection that blogging has with podcasting. I think by marketing the next one as being for bloggers and podcasters (which PodCamp is for bloggers just as much as it is for podcasters just many non podcast bloggers don't see that), it will help encourage non podcasting bloggers to get involved, host sessions, etc...
--angelo