Wave has been incubating for some years now, and, unfortunately, has not shown a level of growth that, in my opinion, would suggest that it is likely to reach graduation from the Incubator.
Unfortunately, I think it is time we accept that Wave is unlikely to reach graduation, and should retire. To explain what this means - as I understand it, the ASF repo would be marked read-only, and after a period of time, the lists disabled. The code would, however, remain open-source, and any person, or group of people would be free to fork the code and continue with it elsewhere, e.g. Github/Sourceforge/etc. In the end, this is a decision of the Incubator PMC, however I’d like to see whether anyone here has any thoughts to add before I put this to the wider Incubator community. Upayavira P.S. This came up on the incubator-general list as a part of a discussion on the Wave report