CommentStreams:D933b3ea4de875da59c8897355e597ff
From The Lost Media Wiki
Interstitials like this don't get "cancelled" or "pulled off the air" in the sense that full-fledged TV shows do. Nickelodeon just decided that the interstitials had run long enough and stopped airing them on their main network. They likely didn't have plans to do any more of the signs.