I never heard of the Southsiders until I attended the games this season. I didn't know that they are "official" fan club for the Whitecaps too. If they want to expand, I think they need a lot of help from the Whitecap organization. If the Canucks creates/prompts an official fan club membership I am sure there will be tons of people joining.. compare to fan club membership named "the Canucks'er" or something like that.
I've been a lot Whitecaps games this season and I've sat in different section. The crowd is dead silent other than the 2 ends of the field. The sections behind the bench or the so-called "Premium season-ticket section" was horrible.. Try to stand up and cheer (even for a corner kick), you will get yell at from left, right, behind... and trust me, there's only a few "fans" in those sections.
The corner sections are much better because 1) cheaper ticket price and 2) closer to the net so much more excited. However, it is extremely difficult to get people singing and chanting with you. The section I sat last game was supposed to be "family zone", there was a guy who tried to rally us to "fight" the singing from the Timber Army. He stood up and yell "Come on !! Go Caps Go", he was a very passionate fan but after 10 seconds or so.... no one responded and the people look at him like he's drunk.. the security guy even walked up to him and "monitor" him closely.