Are there too many animated films being made now? ...
The simple, direct answer? "No."
It's like asking, "Are there too many live action movies?"
Because here's the long and short of it: Animated features come in all sizes, shapes and styles, just like live-action features do. And some of them find favor with the public, and some don't. But the number of entrees in the marketplace at any one time has nothing to do with it. The issue is, does the public like it?
If there were "too many" cartoon features being released, then the recently issued Frozen would never have made $1.2 billion, since it arrived in the middle of what some would call a "glut."
And then Big Hero 6 came out a year later, and managed to eke out $652,031,643. How did that happen? What with the crowded marketplace and all. And then Home, which didn't pick up universally sterling reviews, scooped up domestic box office receipts north of $150 million, so you can just never tell, can you?
Face it. When people want to see your movie, they go see it. Format has little to do with box office receipts.