It's a shame that the EnOcean Alliance doesn't directly contribute to this effort. Support within a platform like OpenHAB2 seems to me like the KEY to their platform's success.
From my perspective, there are not very many worthwhile problems that can be solved with EnOcean hardware alone, e.g. switches outlets, relays, and sensors, AND YET there are incredible solutions that can be accomplished by putting smart middleware between EnOcean and other technologies.
I see OpenHAB as being similar in concept to the Asterisk telephony engine. History shows that the ability to inter-operate, BETWEEN different communication technologies, (and insert workflows & business logic) that caused Asterisk to explode in popularity, and literally transform the industry.
If EnOcean wants their wireless technology to be increasingly adopted, I think they should be bending over backward to promote the powerful interoperability that OpenHAB can provide.