From a reader:

Jonah,
If I can be so bold as to be your “Orthodox guy,” I’d like to suggest
that catholicity does not require vesting a single bishop with universal
authority. As a priest in the One, Holy, Catholic, and Orthodox Church,
I value greatly the principle of collegiality. Catholicity is seen in
the action of the Church as a whole, not in the decrees of one
individual. We do not believe in the infallibility of a person (even
speaking ex cathedra), but rather in the infallibility of the Church.
I apologize that this is hastily written, as I must return to packing
my house up to move (truck arrives tomorrow!). Nonetheless, there
is a Christian alternative to the Roman Church that is not Protestant.