We're certainly hoping to reduce the complication by removing the boundary between (clustered) BigCouch and Apache CouchDB by making the clustering an optional and transparent part of the Apache CouchDB project.
Its not that complex. CouchDB is the core technology that Couchbase and BigCouch, et. al are using to power their more "vertical" offerings, in various degrees. CouchDB is not going anywhere, and its a great standalone product.
