I think this is well intended but not necessary. As far as creating a group that has the "ear of Twitter", I think this is list is doing quite well in that regard. The Twitter dev's have been very responsive and so far we have a nice community of third party devs as well.
I agree with Bjoren, I feel this would just add an unnecessary level of politics. If I chose not to join said alliance, would Twitter care less about my voice? Again, I don't see how this group would be beneficial in anyway that this list isn't already providing. Lastly, I don't feel that I, or my App, have rights to access Twitter's API. It's their system, my access is a privilege. +Clint