So, I'm something of a mid lane AP Nidalee main, I kind of have a strong opinion about this. Basically I think AP Nidalee jungle is going to fall off in a few weeks time even if she doesn't get nerfed. Maybe I'll eat my words, I don't know, her win rates have gone up in the past week or so. If they do "nerf" anything though, I think they'll just change her hunt reset passive so she can't reset her pounce multiple times in a jungle camp (killing units is probably fair game, but IIRC she can reset the pounce on hunted monsters multiple times, instead of just once per monster), since that's just abusive and I'm pretty sure isn't working as intended (Edit: I remembered incorrectly or they stealth fixed it; pounce only resets once per hunted monster. I did however, learn of another abusive mechanic that I think is unintended, where the root with the hunt passive allows Nidalee to soft leash for herself; basically a Nidalee-specific loophole to the soft-leash changes they made that killed all the ranged junglers before, which is why I think it's unintended. I think the intended use for the root is to make it easier for Nidalee to pounce to jungle monsters after throwing a max range spear, since they'll usually walk outside of your pounce range if you are on the other side of the wall. A solution would just be to make the root occur at "max range" damage, 1300-1500 range, so that she'll have to be well outside her auto attack range to root monsters). I honestly don't think they'll take any damage off of her, because, as you saw, her damage isn't that threatening coming from a jungle Nidalee in the mid game (early game she's got a lot of burst, but that's kind of the only window she has to snowball herself), since she's behind in gold compared to a solo laner.
Sven got 4 early kills to snowball him and then what? He was basically just healing people the rest of the game. That's all AP Nidalee provides; damage, heals, and a bit of 'vision' with her traps. She's not building tanky so your team is down a traditional front liner in their jungle; even an assassin like Kha'Zix or Rengar builds tank after like two damage items, sometimes earlier. She's naturally down in gold because she's in the jungle, so her damage in the mid game isn't fantastic unless she gets insanely fed. She doesn't have any CC to set up kills for anyone other than herself. You basically have to build a team around an under-fed mid laner, because she's not going to be donating many resources (kills, farm) to her team the way other junglers can afford to, since she needs the gold for items to be relevant. Maybe you stall for late game for her to get full build, but then everyone on the enemy team has a Banshee's Veil and your spears are practically useless unless someone else on your team is bringing poke or something to pop the Banshee's.
Couple that with the fact that she's innately difficult to play from the jungle even for pro players. Yeah, she's probably the most mobile champion in jungle in the game just because of her dash and her passive through brush, but landing a spear from the jungle into lane for a gank is one of the most difficult spears to hit (jungle -> jungle isn't bad since pathways are a bit more narrow, and if you're in lane, lane -> lane isn't bad either since you can afford to wait for a good opening, as well minions form barriers that make it easier to funnel spears around); it's traveling as slow as like a Morgana binding with like 1/5th of the hitbox; player movements are much more difficult to judge when you're coming from the side rather than coming from lane, and if you miss or you have to wait around for a good spear to line up, you're wasting a ton of time as a jungler where other junglers can just force a gank much more easily.
I watch a lot of Nightblue3, and it's been annoying me lately how high he's rating Nidalee jungle because I really disagree with him; heck I've seen him play games where he gets insanely fed in the early game, and then can't do anything for the rest of the game; basically the same thing that happened to Sven in SK's game.
Again, maybe I'll eat my words, I don't know, but in my mind coming from what I understand about AP Nidalee, knowing what a mid-lane AP Nidalee is capable of and seeing what a jungle Nidalee can do, I don't see jungle Nidalee being more than a passing fad just because of how she works as a champion and how the jungle works. Sure you can probably get away with her in solo-q, but you can get away with a lot of things in solo q, lol.