Let The Market Decide
I say, let the market decide. I've never watched Rugrats, and don't care about it at all (that's the way I voted), but if other people watch the show, and like it, then more power to them.
I know I'd be angry if some Rugrats fans who hated my favorite currently running TV show (Justice League) started saying "Man, that show shouldn't even be on the air, because..." If Rugrats fans don't like Justice League, then that's fine with me! Each to their own, as the old saying goes. Just don't try to bring down Justice League because you don't happen to like it!
Since I'm not a Rugrats fan, I don't want to try to decide for Rugrats fans when their show should end. That's for the Rugrats fans should decide (with their pocketbooks, and TV remote).
Favorites! (1) Action: Transformers & G.I. Joe; Visionairies; The DCAU; Robotech, DBZ, Cowboy Bebop, Samurai Champloo & Trigun; TMNT, MOTU; and Avengers: EMH; (2) Comedy: The Simpsons & Futurama, Space Ghost: Coast to Coast & The Brak Show, Sealab 2021, Harvey Birdman: Attorney at Law, ATHF, The Boondocks, The Venture Bros., and Archer