I think that is the master plan.
The danger is that some ambitious AG will invoke the RICO laws against a diocese. In some states, the corporate is such that the diocese has legal control of the property, and can be used in a bankrupty (Missouri for instance).
It is a mess.
It seems that distinguishing between diocesan property and parish property will in the end require them to choose. If the diocese goes to great pains to prove that parish property is not theirs, then the parish is free to do with the property now considered "theirs" as they wish.
Personally, I think parish ownership is the right answer, but with it comes a whole new set of issues.