This is only true for content producers. As long as the content producers use other means than G+ to publicize their content I, as a consumer, have no incentive

This is only true for content producers. As long as the content producers use other means than G+ to publicize their content I, as a consumer, have no incentive to use G+. So to me this still seems to be a losing proposition. Consumers vastly outnumber consumers and when the producers act as consumers they are still free to use whatever they want.