I think some of you need to re-interpret what Riot Jag was saying. He's speaking in context of the Elise nerfs which are exceptional early game ganking and objective control:
"On another note, I think some of the Lee Sin comparisons here are fair."
He isn't saying that it's not ok to have champions that are strong early and get weaker late game, he's saying that this playstyle of champion is dominating the meta. If your champion can't do what Elise, Lee Sin and - to a lesser extent - Vi and Kha'Zix and friends do early to mid game, then that champion is simply going to be a tier below.
To all of you claiming that smoothing out Lee Sin's power curve will lead to boring homogeneity, well, that's exactly what the jungle is right now. The ~6 or so top tier champions are similar to each other. In competitive play, there are no top tier counter jungling duelists (Udyr, Shyvana, Olaf), there are no top tier utility junglers (Maokai, Nunu) there are no top tier mADC carry junglers (Tryn, Yi, Jax), and there are no top tier tanks (Nautilus, Sejuani).
In what world are slight Elise nerfs and Lee Sin power shifts not worth potentially and significantly opening up the jungle meta?