There are a lot of use cases, particularly around multi-region/DC master-master replication, where CouchDB/Cloudant is a great fit. IBM also offers MongoDB, RethinkDB, Postgres as managed services and the MVCC/conflict model in Couch is still a standout feature. The other use case I see a lot of is offline-capable apps backed by Couch replication-compatible datastores (PouchDB, Cloudant Sync, Couchbase Lite).

Cloudant recently changed its pricing structure [1] (via IBM Bluemix) which should significantly reduce the cost of continuous replication - that may be worth a look if the current model is problematic.

[1] https://developer.ibm.com/bluemix/2016/07/26/cloudant-public...