If you're getting rid of non-Japanese animated shows, shouldn't we also get rid of Japanese shows that aren't animated? Things like Super Sentai and J-Drama (If we have many of that).
Doraemon is much more popular than you're giving it credit for! He's basically a Japanese cultural icon. You'll find more people that know Doraemon than people that know Naruto and such in Japan.
It's not unusual that people in China are very well aware of him as well. Plus there's a lot of merchandise potential with a cute mascot character.