Turtles Forever really did seem like not only a very good way for the 4Kids series to end, but a great way for the franchise to have come to an end. Not that I would've wanted the franchise to die after the 4Kids series, but TF would've at least gave it a nice send off.
Yeah, it's not the worst tombstone there could be for everything pre-Nickelodeon/Viacom, really.