The only method I could really see working would be a GC boycott, which really would be difficult, given the size and span of Gaia's forums.
Spreading the word could happen, though it'd be difficult, and really, Gaia has enough big time spenders that I don't think it'd really be effective in the end.
Gaia knows that a large portion of it's userbase isn't happy with their recent actions, they just know that a larger portion is still gobbling up GC and CV items.