[zardosht]

One big differentiating feature between TokuDB and other write optimized databases is that TokuDB is fully transactional, it is ACID compliant. There is a demand for this.

AFAIK, TokuDB is the only write-optimized transactional data store. We (I work at Tokutek) are working on integrating with MongoDB as we speak, and when we do, we will bring transactional semantics to MongoDB in addition to improved performance.

So, I think there is still a big demand out there that TokuDB will be able to meet