Are you sick of Di Gi Charat yet? A complete reboot this time, with all the sharp edges now pretty much removed from the franchise. Lasted a year and then Japan’s brief love affair with the alien cat girl had ended.
Or Brocolli/Gamers had run out of money to fund these vanity projects.
Probably the latter.
There was one more OAV in 2006 and that was that for Di Gi Charat’s anime career. Well apart from the occasional cameo…