Riot seems to refuse to realize that wards have become a gigantic problem, and it only got worse in season 3 when they made map vision go from easy to get and hard to maintain to easy to maintain and even easier to get. Sightstone was a mistake that never should have been added, and I called it that the day they revealed it. What they should have done is put a limit on how many wards can be bought as a function of time, or at least let clairvoyance reveal wards.
Especially when you have supports running 2 or 3 ruby sightstones, Its just a GG, They can see everything at all times. Granted Oracle's still lasts 5 minutes, but you don't have to time to be killing wards as jungler when you should be Farming wolves, wraiths, red and blues, plus you can't go in for a gank if every single freaking lane is warded. It makes playing as jungler unfun and a pain in the ass knocking out wards.