Father Jenkins does a great job of articulating the more moderate sedevacantist opinion, that to which I myself lean. I have called my own position "sededoubtist" but Fr. Jenkins articulates the same principles to which I hold.
At one point he states that he does not consider dogmatic sedevacantists to be Traditional Catholics because they are usurping an authority they do not have.
This is almost verbatim the position I hold ... except that I also hold to a variant of sedeprivationism.