That does clarify your original intent; I see now that you were advocating "the new paradigm" rather than offering a means to recreate the earlier one.
As for me, I have only occasionally used the breadcrumb paradigm so far, and never as a total replacement for the navigation pane. I suppose I will have to disable the pane for a time and see how the breadcrumbs affect my workflow. I have been very heavily dependent upon the visual aspect of the pane and being able to see the hierarchy and the relationships... but technically that information is also available in the breadcrumbs, just not as visually complete. We'll see.
As an addendum, it's worth noting that, in spite of that twice-over redesign you mentioned, Explorer apparently still accepts all the original XP-era command line switches, like /root, even though they have no relevance and seem to be ignored. If the switches no longer do anything, then for gods' sakes why not remove them and generate some polite warning or error?