Certainly some D-side will be easy - for example, I know of one location where something like 50 pair external 9mm is run overhead for 3km before being split.
Around here there are poles with defined max loading - max number of drops in any arc, and they have been taking out redundant copper drops to allow fibre to be added. It all goes back to the local depot (or should) for recycling.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
M H C
taurus excreta cerebrum vincit