The best way they could have made this change is to simply switch every service currently in use to it's highest value so as not to affect existing cities, and make this feature something that only new services need to be upgraded. As in, don't mess with existing cities and services and don't break what was never before broken. Don't waste players time and resources, just make this new feature available to those who need it. Not force everyone into making major changes that, in the end, don't even begin to correct the damage caused by this faulty change.