I suspect this interdict won't mean much to these folks. They'll just go right on receiving the sacraments and doing what they were doing. Burke still has to come to them if he wants legal title to the parish.
Ummmnnnhhh....
You may have missed the point. Burke is trying to tell these people that their stiff-necked resistance to the rule of Canon Law will (WILL!!!) endanger their salvation.
You may characterize this as a 'temporalities' issue, and it is--but that's not the important part of the story.