Totally agree... when I close my eyes and image what a small raiding party might see if they even made it deep enough into Lustria to see a true temple city, then the structures would be as tall as mountains and the ground would be a moving sea of millions upon millions of Lizardmen. Statues would stretch into the sky and huge beasts the size of the worlds biggest ships would be being coerced into work by Skinks.
The Slann are like Gods... they have the power to shift entire lands and create things beyond our imagining. I dont want the Warhammer World to be limited in the same way as the real world. It is an awesome place, in the true sense of the word.
Got my vote.
Though I imagine the cities will be past their prime - I imagine -3000 IC they would have been mind blowing even by 'modern' standards