Pink smite is not healthy for the game if it becomes the only option
You can add it as an additional choice than fine, but having it as the only option is not fair to junglers. Counter junglers might love it but everyone else is not gonna benefit nearly as much.
Some would argue challenging smite is op, so to those Vayne players complaining about true damage, i feel the same way every time I see your champion. As for the mid laners complaining about the burn, you have ignite, so unless I play shaco I am forced to have a disadvantage automatically?
Plus control wards are very limited, and while useful, it's like buying 3 at the start of the game, you place one, and have another but how's that helping you? You just have it there, a free 30 gold for passersby.
Plus it's extremely limited because it encourages counter junglers, meaning normal junglers are going to be too busy defending their own jungle to gank for you.
Not to mention how un-noobfriendly that would be.
So go ahead, make a valid argument on how that benefits ALL the junglers and not just a select few. I'll wait for a decent argument.