Getting taller and taller...realistic or futuristic?

Click the picture to see larger view.

The Effel Tower Paris 318 Meters	Jumeirah Dubai 321 Meters	Jin Mao Building Shanghai 421 Meters
Sears Tower Chicago 443 Meters	Petronas Twin Towers Kuala Lumpur 452 Meters	Taipei 101 Taipei 508 Meters
By 2007 Shanghai 492 Meters	By 2010 GuangZhou, China 514.8 Meters	By 2010 WTC, Manhattan 541 Meters
By 2007 Tokyo 600 Meters	By 2008 Dubai 705 Meters	By 2020 Shanghai 1228 Meters