I think that sometimes it's good to "cut the cord", but then the question becomes, "What do you do with all that legacy code?" Do you just hit "delete" and poof, it's gone? I've been wrestling with that lately and as a result, have kept around a lot of bad code that I've been "meaning to get around to rewriting", but I just don't have the motivation, especially when there are newer technologies and development methodologies/approaches that are much better and would produce a much better product. So, in many respects, I see our "agility" as directly proportional to our "motivigation" (or lack thereof :-)