I hope Bethesda stop using 4xMSAA for Skyrim and go with FXAA instead - perhaps that'll also allow them to push out the draw distances and LOD.
It's pretty trivial to substitute FXAA isn't it? They wouldn't have the tiling overhead and would get some RAM back as well.
I don't think could free something the use of 4xmsaa or less, in the RAM use imho. On the 360 at least.