I think LEGO could create a product theme called Micro City.
This theme could be devided in some sub-themes:
Micro City - Skyscrapers
Micro City - Buildings
Micro City - Infrastructure
Micro City - Vehicles
Micro City - Landscape
And some special themes:
Micro City - Emergency Services
Micro City - Construction
Micro City - Port
Micro City - Airport
'Micro City - Skyscrapers' would be the first subcategory to sell and the others will follow later.
In the screenshot you can see some skyscrapers I made for this Micro City series.
These buildings will get nice looking base plates later, while I'm still working on them.
- Beacuse of the high number of pieces and the high price of the Micro City - Skyscraper Series (up to 12.000 pieces in the 'Big Twins' set) I would recommend these sets to advanced builders. Other sets could be used by starting builders as well.
- Expert builders could build in some lights to give the buildings an even nicer look in the dark.
- I estimate the price in a range of 50-250 Euros for the skyscrapers and 25-50 Euros for the smaller buildings and other sets.
The scale of the skyscrapers is 2 plates equals 1 floor. Let's say 2 plates are 6 millimeters in height, so a 100 floor building would be about 60 centimeters high. This scale is used by some other builders as you can see here: http://www.flickr.com/photos/37034043@N07/6109807476
The scale of smaller buildings will be 4 plates equals 1 floor like this: http://www.flickr.com/photos/59481634@N00/4199403964
The scale of vehicles would be this: