I support all but reaching, starving, aggression (partial-support, actually, but it's feels kind of pointless), and the last three. We have milk for curing. I'm all for hunger as an offensive potion. Why drain someone's hunger? Because if you drain it past 9 bars or whatever is needed for hunger regen, they can't regen their health back without eating, thus making them easier to kill. If they stop to eat, they can't easily dodging or keep running from you. Oh, if you manage to get them to 3 or less bars, no more sprinting. >:D
My probs with "Wisdom" is I prefer it remain a villager-only thing, like chainmail armor. It would feel less special if you could just brew it. Ignorance just sounds stupid. Oh, the irony of that statement. I feel the same way for Starving. Aggression could be interesting, but wouldn't they attack you to? I don't see much use of this outside of creative and trolling people as an admin in creative. Actually, them attacking each other would kind of help, but if they still attack you.. ehh.. As for reaching, we have enough with reach hacks on pvp stuff and adding a mob sounds even more dumb. Oh, and stickiness? Why not just a slimeball instead of a new animal and rare drop?
I'd like to add a potion for poison resistance. It wouldn't be upgradable in level, but would be in time limit. Poison resistance makes you immune to cave spider poison or poison potions for a set amount of time. (milk only cures that one time.. It does not make you immune to the next time the cave spider hits you.)
I might remove the potion of wisdom and make it be for trading only again. I'm starting to dislike ignorance, too. I feel starving is fine, though. It is basically poison but for the hunger bar. Aggression is mainly for creative use but it can be helpful in Survival mode. I'm not removing potions of reaching, they're one of my favorites. I do plan on changing the elephants to ostriches, though. I made stickiness the way it is for three reasons:
1. Makes it harder to get.
2. Adds a new animal to Minecraft, which Minecraft needs more of. Especially animals in jungles. The jungles should be alive with many creatures.
3. Encourages exploring, especially for players that live very far away from a jungle.
I'll probably add poison resistance, but I'll make it pretty expensive to create.