I'm talking animation serials in general. Aside from the KidsWB 1999-2001 and Toonami, how often have networks had more than one new serial show?
For instance, Disney only had Gargoyles, while Nick only had Avatar. Even then, The Spectacular Spider-Man dominated the non serial shows on the KidsWB line up.
Even then, as I said, it took at least a decade until adults gained any exception of animation at all (Simpsons and Beavis & Butthead aside), but that changed with Adult Swim.
Because they took a risk in running Spongebob when it wasn't the current cashcow and it paid off. To reverse my previous comment, had Avatar, Danny Phantom and Avatar aired earlier in the decade, they'd get more of a chance to stretch their legs.
They took the same risk with Fairly Oddparents (which wasn't in the same league as Spongebob or Rugrats in the first season).
Their first major Nicktoons (Rugrats) wasn't a hit until Season 3 hit syndication, so it seems pretty risky that they didn't pull it after Season 2.
Actually, back when they took chances:
A. Their shows either made it up to 90 or more episodes. Even if they didn't there would still be some requests for them to air in syndication.
B. Even if they ended at 52-65 episodes, they were still apparently successful enough for reruns. Thus they weren't forgotten instantly. Probably helped that they didn't air excessively before ending either.
Now compare it to Nick's play it safe era:
A. Not a single show since Fairly Oddparents (The last show which that was given time to find an audience) has gone over 65 episodes or is still continuing.
B. Aside from Jimmy Neutron, not a single show has been allowed regular repeats.
I think the risking taking era had the advantage all around.
How so? If they take a chance now and fail, they still have their successful shows to keep them going. I mean how much damage could one failed program make when you have 9 other programs bringing in the dough?
Besides, if they would cut back on Spongebob airings it would lower the risk of the show burning out, hence the show could probably remain on the network up to 2020.
I agree that they should play it safe, but the best way to do that is showing caution, not panic.
If they are really planning longterm, but the whole focusing on the hits without giving other shows a chance for growth stinks of focusing on the here and now.