As you note, nice orthophoto scenery is very large and is a resource and space hog. The default world scenery is already big enough, so LR has no plans to ever implement orthophotos by default.
We're always looking for ways to make the sim more like the real world, and if we want better default scenery the way to get it is to have our artists make better layers for autogen. However we are a pretty small team and have a limited amount of time and person hours to make all the improvements we and all our fans would like! :)