I don't think people understand the point of these nerfs... Shurelia isn't sitting there going, "I can't wait to nerf all support until they are utterly useless!".
Instead of spending 30 minutes sitting in the middle of the lane last hitting because nobody can take a turret since someone is always in lane, the idea is to reduce the flat healing in exchange for other bonuses (Armor/Magic Resist). The idea is so the game doesn't drag on for an hour before people reach bases.
You're job isn't to carry, just take whatever CS you're carry can't get (if they're out of lane for example), get Heart of Gold, Philo Stone, 1 gold per 10 sec Quints and get assists and control dragon and Baron thanks to your wards...ta da. Essentially it feels like they want to make support more like Janna (shield and small heal on Ulti), which is fine. They just don't want the 30 minute farmfest...