-1 For ocelot, bat and wolf spawners. These mobs don't really have any drops, so all adding spawners would do is ruin their head prices.
-1 For creeper and magma cube spawners. The more spawner types there are the worse hunter job will be. Also it is kind of nice that there are some mob drops that have to be obtained by more traditional methods, rather than by basically being "cheated in".
+1 For chicken spawners. Since chickens lay eggs, which can be used to spawn more chickens automatically, fully automatic chicken farms can already be created. This already has deflated the value of their heads, and since their drops aren't very useful or valuable(except with their meat in villager trading), I feel like they could be added.