Will be achieved when other issues* are resolved.
When MultiMen came out, Ankama capped prospecting and wisdom (what you would call a nerf, as drop rates remained the same). Troyle stated on November 27th, 2013, that the drop system is still a work in progress. We have since had no changes or news on the drop tables. (Unless I am mistaken, please correct if so).
Market Listing and Storage*
The limitations on market listing and storage causes many items to be discarded, crushed, and destroyed that other players could have other wised used. If more items were available to be sold and stored, the grind for crafting would greatly decrease.
The profession system is getting a revamp. We don't know exactly when and it is subject to many changes. Keep an eye on it here.
Multitude of bugs
There are many bugs in Wakfu that disrupt gameplay and cause frustration. Many are being addressed as updates continue. You can check their status on the changelogs, or report an issue here.
The English servers, especially Nox, have expressed concerns over the declining player base. Although we haven't seen any official expansion of advertisement, there is hope that the Wakfu Animated Series Kickstarter will bring new interest and faces.
A lovely feature in Wakfu's predecessor. Currently, getting disconnected in a dungeon or a boss fight can result in death, teleportation and loss of any xp and drops you were investing a lot of time in to get.
Another feature in Wakfu's predecessor. It cut's down on time and error, especially on those repetitive dungeon runs for boss drops. With the click of an icon you can go from fight set, to prospecting set, to wisdom, to cosmetic, all without forgetting that item that could have killed your set bonus.
Secondary issues, "wants" such as; class fixes, content, gear, cosmetics, pets/mounts, gvg, guilds, etc, are all spectacular and wanted, but I'm setting these aside as not every single player would benefit from them*. Ankama has been working on the majority of these "wants" and cant be monitored in the changelogs.
*Class fixes would be at the top of everyone's want list. I'm not saying they aren't important, they are very much, they will just take a long time for the Dev team to get to every single class, so I'm separating by neccesity and effect.