CS I really doubt will ever match VB (VBulletin) feature for feature so I think that dream has to die - those guys have just been at it too long.
However - Many VB users feel like they are being left behind in a web 2.0 world because they don't even have full community features and CMS capabilities and other features that CS has.
There's definitely this convergence going where different pieces like blogs, forums, social networking features, etc are being combined to try and establish a new bar what is a great system with maximum relevance and utility to users.
The good news is it seems CS gets this vision and is helping to define it.
I would agree components such as forums need to be top notch even in this unified world - I just don't think forum feature supremacy is a deciding factor.