Yes, we have 182 total ninjas and the meta is composed by ~15 ninjas.

It's due to the simple fact that most of the ninjas in the game atm are simply upgraded versions of pre-existing ninjas.

That's why i'm looking for 5.0 so much... most of the newer ninjas we shall expect (with some exceptions) will be side-grades, giving us more liberty when building "inside the meta".