Actually, there was added certain kind of AA some time ago, which significantly improves the quality of baking procedural materials generated by random noise textures. But alas, this is not the complete AA filter that would work also on mesh geometry and intersecting edges
Related patches to this AA filter: https://developer.blender.org/T43388 https://developer.blender.org/D1254
Yeah, it's sad for us that the development of baking in Blender is so slow. Many times I have been hesitating to migrate to 3D-Coat or Substance Painter for baking, but these programs has other nasty issues, e.g. they don't allow to bake and export any full/combined pass including light effects, which we need so badly for SL.