It seems like a good idea to start by thinking about what's wrong with professions now. For starters, some of them are pretty awful to level. Leatherworking and Skinning are two that always seem to come up in discussions of the best and worst professions to level. And many of the crafting professions have material demands that so heavily outstrip supply that it's a hassle to get them done without raiding the auction house.
Catching up and staying ahead
The problem is less troublesome with professions that require gathering rather than crafting, such as Mining, Herbalism and Skinning, especially as the former two have a Pandaria catch-up system in place. Given how well those have worked, it's surprising that no such system has been implemented for Skinning, so it's likely to me that that's something coming with Warlords.