Adobe have plans to create some form of Acrobat User community. As I am involved in the UK Acrobat User Forum I can see some problems with this if it is true that Adobe will not support groups that include discussion of other PDF products.
See interview with Carl Young in Planet PDF
He seems to have been not much clearer on Adobe pland after the PDF Conference and had some doubts about the '100% Adobe focus' - ''not being open to any solutions from any other, third party vendors, however valid or useful they may be". I think he has got a point. PDF has been intended as an open standard of sorts. Adobe has built up trust around this and there are ISO supported standards for pre-press and archiving. How are these to be discussed? So far the development of Acrobat has been helped by wider support for PDF.
Recently Seybold Seminars have been cancelled. Adobe Live is a great event and explains a lot about Adobe. However this is not the same as a Seybold event with editorial comparison of different choices. Once Macromedia is gone maybe there is not much to talk about. Still, something has changed.
Moving into the enterprise area is a new phase for Adobe and PDF. The established decision makers already have forms of communication. Adobe is only a part of this. Response to closed situations is likely to be limited.