I think that there should be support for lightmapped models for A7 and wed. It will also be better for managing LOD for level geometry. Wed should be made only to place models/geo and Med should have the import and arranging of textures, shaders, and at least 2uv mapping for light mapped models. Though there should be some terrain manipulation in wed.
The FBX import/export pipeline is the best solution. Now A7 has to support lightmapped model integration into the pipeline, both Wed and Med. There are better Model/Lightmap creation tools from 3d party. A7 has to only support these into the workflow.