I just spent some time on United Future.  I am guessing it is a cheaper platform than Wondercafe.  Skimming a few posts over the past 4 months shows that there seem to be even fewer people posting or commenting on that site than on Wonder Cafe.  The participants seem to be mostly UCC members or clergy.  The post with the greatest number of comments that I found had 17 comments, most of which were simple agrees.

Hi Folks, I hope you will participate in this United Future conversation. It's a great chance to let the Comprehensive Review Task Group and others across the church know about your hopes, dreams, visions, and fears for The United Church of Canada as we move into the future. There are several exciting things in the works coming from United Future, watch for more information soon!