This is a good solution to the incoming Vayne spam because of pink ward changes...
Riot need to take a leaf out of Blizzard's book and create a champion like Tassadar in Heroes of the Storm. For those who do not know, he is a ranged support with an activatable passive which gives him a large amount of vision and reveals any stealth heroes within a certain vicinity. Because it has a range, it is pretty easy to balance and would be a good ability to add to the game, specifically to deal with 
and 
that use stealth in a small area but would still allow Riot to do as it wanted with assassin stealth changes in other lanes.
Since 
will no longer reveal stealthed champions.
