Posted by Killua*

Guilty Crown would most likely not get a second season for two reasons.

1. The director has never made a second season in any of the other work he has done.
2. The director would more than likely work on a second season of Attack on Titan over Guilty Crown.

(Note: The director [Too lazy to google his name] has worked on famous pieces such as Attack on Titan, Death Note, High School of the Dead and many more.)