Pink Wards!
The pink ward cap is fine, but defending against invisible champs is near impossible. Sure, you can see when someone is attacking it, but usually it's the laner or the support, not the person you're trying to protect yourself from. The pink ward was fine when it was invisible, and should be for season 4. Teemo, Evelyn, Twitch, and Rengar are currently wrecking solo queue because we cannot do anything about it.
"Make me invisible again plz! Save the squishy supports from the Rengars!"
(Also if you put a pink ward in the rocks of the dragon wall, the enemy can't clear it but that seems more like a bug)
was made for clearing that bad boy out.
If they wanted to change it, pink wards should last forever, but after 2 minutes they should become visible like they are right now.