The FSSP is juridically a different kind of organization (technically a “clerical society of apostolic life of pontifical right”). They wouldn’t ordinarily be headed by a bishop. The closest analogue to the ordinariate are the “personal prelatures” like Opus Dei, which are headed by bishops.
I think you or I would be eligible to join Opus Dei tomorrow, if we wished to. Not so with the Ordinariate, which appears to be quite exclusive:
This "particular", and obviously exclusive, church disturbs me. What happened to the One Holy Catholic and Apostolic Church? For instance:
With their own bishop, said Msgr. Entwistle [the ordinary of the U.K. ordinariate], "we have become a particular Church. This is a statement of confidence from the Holy Father."
As far Dinardo's Co-Cathedral of the Sacred Heart, I'll never darken it's doorways with my shadow until it is reconsecrated as a Catholic church.