As I said in an earlier post, this issue has been thoroughly argued here and elsewhere. In naming it tis morning I did not mean to engage it again, although I respect the fact that perhaps you and I haven't engaged on this before.  I'm going to confine myself to a comment on this:
<The point is--whether or not we do that is for the Magesterium to figure out.>
That's true if, and only if, you understand "the Magisterium" to include the whole people of God.  The papal/hierarchical magisterium can be wrong, often has been wrong; it can change and it has often changed.  To deny either the reality of mistakes and the fact of change is to reduce the concept of of 'magisterium' to superstition -- which is precisely what some folks do.