To be fair, that's always been the case with technology. The difference is that digital moves faster than analog and adds an additional layer of incompatibility

To be fair, that's always been the case with technology. The difference is that digital moves faster than analog and adds an additional layer of incompatibility. NYC is currently learning that lesson all over again (or more likely failing to learn it) with the long overdue and long-dragged-out upgrade of our subway's 80 year old signaling systems. (Not to mention the hundred year old water tunnels that we can't afford to take out of service for repairs.)