Noted from the Skin Spotlight short on current PBE changes. Seems like Sion is getting a rather big buff to the E duration. So not all doom and gloom I suppose. :
Sion: Champion Spotlight | Gameplay - League of Legends - YouTube
Sion (Character) | League of Legends Wiki | Fandom
Sion Rework Gameplay 2014 - Champion Spotlight - League of Legends - YouTube
Sion/LoL/History | League of Legends Wiki | Fandom
Surrender at 20: Sion Champion Update
Sion: Champion Spotlight | Gameplay - League of Legends - YouTube