To the people who can't imagine them stopping.. it won't be an instantaneous moment from where 100% of the 'publishers' can suddenly stop going door to door. It will come as a slow reform, which has already started. You can now count 'family study' as service hours, you can count 15 mins as service hours. At a certain point they might say that those with physical problems only have to make 15 mins in a year, instead of a month. They will say that people like elders don't have to have that many hours because they already spend many hours preparing for talks and other works. Then you will find that only the service overseer will go into FS, and the other elders will be hardly seen going door to door.
Then they will say that some are simply not meant for the preaching work (Ephesians 4:11) and that just like with the anointed you would feel a special calling to preach or not.. and pretty quickly there will be few left who preach more than 5 hours a month and many who don't preach at all. I haven't seen my 'active' wife going into service for two months now, but she still reports hours because she has told a coworker she was going to the DC (5 minute conversation -> 2 hours of FS reported). Many JWs operate in this way.