So how do you propose this to happen -- when even a new device (company/brand/model) comes out, a new forum gets created at MeeGo.com? That would mean creating a forum for each new Nokia Harmattan device, Symbian device, Intel device, Clarion, LG, Acer, Dell, etc.? If those forums are not created, there will be discussions regarding those devices anyway. Isn't it better to just go to TMO or to moblin.org to just discuss about a specific device?
Artificial forums (e.g. Nokia Devices, Intel Devices, etc) can be created that when clicked, go to the specific company forums, TMO or forums.nokia in Nokia's case.
While your example shows the wrong way of saying it, I believe that a lot will reply nicely that they have seen a discussion (link added) about a certain topic at the TMO or at moblin.org.
I'm not against having just one forum since I think it can be forced to work. I think it's just more organized to have some forums maintained where the correct organization or company has more control over.