As I recall, the primary reason for changing the "OpenACS" name was to prevent confusion/comparison between ArsDigita's new Java direction and the OpenACS Tcl version. Now that aD is no more, it seems that reason is no longer valid.
Furthermore, OpenACS has been receiving an ample amount of exposure from people on discussion forums saying stuff like the "ACS will live on through the OpenACS community." It seems that changing the name now would confuse some people, and the community would lose some of the identity it has already established.
A few years ago Silicon Graphics changed to SGI, and look at its stock price now :).
I say keep it as OpenACS.
