I think "Trekkie" sounds more like Fan boy, rather than a real counter or subculture phenomenon. I think "Punk" is a better comparative, where the punk culture had a distinctive departure in art, music, and philosophy. The popular culture often misconstrues the assimilation, for the reality. For instance, the Hippie movement in the 60's was a counterculture revolution, but on the heals of the real revolution, fashion, advertising, and marketing hijacked the movement and adopted it for its popularity and ability make a buck. Since it became mainstream, the fashion, music, and art that was formerly associated with the movement was worn by people who were diametrically opposed to that movements philosophies. I don't think of all subcultures are rebellion, but rather a creative exploration of alternatives to the humdrum of the normal.
Also, when a movement has moved onto the "shock" radar of the popular culture, is when I most notice youth flocking to use it as a means of expressing rebellion.
Also, when a movement has moved onto the "shock" radar of the popular culture, is when I most notice youth flocking to use it as a means of expressing rebellion.