I agree, Penners, on both counts.
Firstly ... the unpleasant comments and behaviour on DW Monthly. These may help people to blow of steam, but they won't help anyone in the long run and will, in fact, simply divide the world-wide DW "community".
Secondly, the hard time forecast for Rob at the next convention. Much as I may wish it otherwise, I can see this happening too. I don't think this is necessarily Rob's fault - from what I understand, this was a nasty trick that was pulled behind Narrativia's back, and unfortunately, there's not much Rob can do about it. Some people will be upset with Rob, but that's only because he is the "public face" of Terry's estate. I think the best thing for Rob to do may be damage limitation, but of course, I don't pretend to know or advise Rob in any way. What he does about this is his own affair.
Personally, I am not convinced that this new TV series is the best way to go to attract new readers to Discworld or to keep existing fans. I am willing to give it a chance, but from the stills and press releases I've seen, it's on a very short leash.