Nishant,
I understand and agree with your assessment on that. I agree that many sedevcantists maintain including priests maintain themselves within the SSPX or if they are not with the SSPX at least towards them. This is good and the way it should be. All of us Catholcis are in the same boat, whether we recognize it or not.
My point though goes a little beyond this. Whether one is holding the current SSPX position or sedevacantism, we both agree that there is currently no authority teaching and governing Catholics at the moment. In this crisis, we are on our own, and the only place we can find the answers to how Catholics can correctly react to the problem of a heretical pope, is in the writings of the Popes, Doctors, theologians, canonists, and Church historians of the past.
In my opinion, the society has created a position which confuses the idea of how to resist a "bad" pope with how to resist a heretical pope. Secondly, I do not believe they have fully grasped how the Church could give evil universal laws, evil sacraments, i.e. the Novus Ordo, and heretical teachings, and how these can be reconciled with the indefectibility of the Church, and the holiness of the Church.
There are other grave points that they have not addressed as well, but I am sure you get the point. This does not mean that I do not appreciate the Society and the work they have done over the years or bringing the Faith and the sacraments to countless souls around the world, but, this is more a plea to them, if they are reading this, to study the crisis, deal with the hard issues, and form a correct Catholic response.