There is still a long way to go. Most developers do not know how to implement authorization. At best they have heard of RBAC but often they'll try to implement it themselves rather than use a library.
There are a few things we could do:
Continue increasing the knowledge base on ABAC online (pretty much what I have been doing)
Collaborate with other entities e.g. OWASP, NIST, OASIS (the relevant TCs), other standards bodies e.g. SCIM, OAuth2... We could deliver a cheat sheet for OWASP.
Take part in another XACML interop? Be at another security conference?