I think many in the neuroscience community would agree that there's a lot we can learn from connectomes, and there's a lot of value from just having a canonical, authoritative map of the underlying neuroanatomy. Every year there are a few new neuroanatomy papers that say "surprise, area X projects to area Y!" and that's sort of embarrassing given that many people have been studying an area for 30 years and the sudden appearance of dopaminergic projections upsets all their previous models.

Also, there exist brain areas and regions where we do in fact have a few good good models, and connectomics has the potential to help us resolve them -- see http://www.nature.com/nature/journal/v500/n7461/full/nature1...