> which side of the filter are we on?
Well, since we can never know that for sure (even if we identify a filter, is it the filter? Is there more than one?), the best we can do is try to move forward and make it increasingly unlikely that the things we think are candidates to being a filter can effect us. First and foremost, get off-planet, which brings us full circle to Musk, who is on record as stating he started SpaceX to spur Mars colonization.