As I see it, there are two answers: yes, too many android phone brands or no, never too many.
On the one hand, WTF? Why would we, as a species, ever require more than a few brands of gaddam mobile phone? Jeez, what’s wrong with us?!
And yet: Free Market Capitalism, Baby!
So it’s kind of weird though: Android is kind of like PC. Used to have IBM & not many others. Now there are at least a half dozen really popular ones, and several more on the outskirts of popularity. Each one works slightly differently. But an Apple is an Apple is an Apple.
I think the market will stabilize as demand stabilizes, you know, weather permitting ;)