Yes I think we should add other publishers. If we don't, someone else will. Guaranteed.
If there's a strong desire to stay Sage 100 until the bitter end - split off the non-Sage 100 stuff (The bitter end is closer than you think / want to believe).
WRT to Acumatica having 90 Minds be ""responsible"" for Acumatica online forums - yeah, I think the devil is in the details. I suspect they either want that to be public or in some other place their VARS could easily join? I guess a better idea of what Acumatica would want. I'm guessing they would not be interested in funding an area where competitors would have equal footing, etc.