I'm just going by the baseline Disney established during their heyday.
I didn't approve of some of their shows, but they had around 10 series or so running more or less concurrently.
Compare that to their current list of 3, that's 30%.
So, something must be wrong if they're not managing to sustain their prior level of output.
What that might be, I do not know.
Could it be something to do with lack of creators?
As I understand the process, someone has to come up with an idea, pitch it to Disney and then get it accepted.
If there's not enough people doing this, naturally, you won't have many shows.
Conversely, there could be many pitches made, but the ideas weren't deemed good enough, so the production deal wasn't made.
Kids would get bored because there were too many shows?
I don't follow the logic on that one.