Procedurally based environments are by no means out of reach. I agree with a lot of the others that it is the way of the future. It would be awesome to be able to define certain types of regions like arctic, tropical, temperate, desert, etc and then be able to specify the types of trees, rocks, ground cover, and textures you want to use in each area. I'm sure it would produce great results. The great thing is I'm not so sure it would be that much work to implement in LE now. In the end all you would have to do is erase some trees for buildings, roads, etc.