42% fewer employees, 7 years in the future? Including hopes for things like this: "Jansen also said that around 10,000 fewer people would be needed to service and repair digital networks, which “go wrong less often” and can be fixed more easily than older networks." That feels optimistic. Modernization does help with that sort of thing in some ways. But it also often adds complexity, higher dependency counts, etc.
A copper line isn't a continuous thing from the exchange to the customer. It's made of a number of sections that are joined together.
Now someone who once worked for a large British telecoms company once told me that they'd done some modelling, maybe using something like system dynamics if I was guessing, to gauge the effect of work on the network.
Any interaction with the equipment, whether to set up lines for a customer or even fix faults leads to more faults. So it ends up being more profitable to just leave equipment in place than to reuse it.
Based on that I would say that having all the pairs terminating at the cab instead of the exchange and using remotely configurable equipment would be a greater improvement again.
Just guessing you understand, I have no inside knowledge. ;)