It is likely the 'postie' will suffer as a result. From my understanding a pile of junk mail is provided to them for delivery and it is up to them to know which addresses don't want it. Given the number of different postmen we see on our round this is pretty much an impossible task - and they will still be expected to walk at the speed of light.
I wonder when our MPs will enter the real world where people actually live at times. This subject needs much more thought applied than simply amalgamation of web sites. Perhaps, given the push for less waste in bins, there should be a move to stop junk mail entirely and return to advertising hoardings.