Just because you and a bunch of pals from around the world have gathered every Wednesday since the game came out does not mean that you are entitled to play GT5 or any other game online forever. You are going to have to buy GT6 to continue your regular meet up.
This is the reality of the modern age of online play. As of May 20th this year Sony will be shutting off the online server for this and other PlayStation titles. It says:
"As of 20 May 2014 you will no longer able to use the online features of the following game:PlayStation 3Gran Turismo 5
"As of 28 March 2014 you will no longer able to use the online features of the following games:PlayStation 3Resistance: Fall of Man Resistance 2Resistance 3
As of 26 November 2013 you will no longer able to use the online features of the following game:PlayStation 3PAIN
"As of 28 January 2014 you will no longer be able to use the online features of the following games:PlayStation 3MAGSOCOM: Special ForcesSOCOM: Confrontation
"After these dates, you will still be able to play these games offline, with the exception of MAG and SOCOM: Confrontation, which do not have offline modes.
We would like to thank everyone who has taken part in these PlayStation online communities and hope you enjoyed them."Full list of server shut downs is here.