Having this function requires a lot more attention to fine detail. Implementing a simple vote to kick an entire alliance could mean a group getting kicked because one or more entry healers + tanks derped. You could argue that this is fault of the group itself, but it would not be the opinion other groups share.

Unfortunately, I can't see how this function could benefit both entry and geared players symbiotically. In fact, I can see this being the primary reason for the use of this function.