If You're Removing Green Wards, Then...
...how about compensating elsewhere for non-support roles? I mean I'm a mid who plays mages, and I quite enjoy being able to not instantly die whenever somebody picks a high-burst/cc ganking jungler and I need wards to be able to do that
How about Legendary items with ward drop actives? Maybe a nice 100 AP item with about 10% CDR and two 3-minute ward charges? Something that says "You're a wizard, Harry. But you also need those Muggle glasses to see, and I respect that."
Maybe some good and compact gun that gives 70 AD and 15% crit, or even some movement speed with a ward drop. Make sure it's a gun though or else those coddled marksmen won't know what it's for. That ghostly sickle 
just confused them. Hell, they STILL try to shoot four swords out of a bow 
What about a hearty all-around tank item? A ward drop, ~300 hp, 25 armor, 25 mag res? Make it clear to top laners that even though they don't participate in the first 15 minutes of the game, that warding is for everyone
is a great item, but even when upgraded, it becomes a waste of a slot. It's totally okay to make a powerful item whose unique passive is a ward drop.
to have a vision related active other than a skill shot slow active. Maybe I would upgrade it more often and maybe other ap champs would pick it up. Even it was just 
, it would be more useful than it's current active.
cheaper (75 gold now). So this will probaly be the primary midlane buy if you need vision. Than you have to decide between 
that are actualy free now.