I agree that it is jumping on the Hunger Games bandwagon.
The Host is also the same.
Basically, after Twilight made a huge amount of money, there are other books about teengers, made into movies, being aimed at teenagers, trying to capture the same audience.
The Host didnt make much money, so the other 2 films probably wont be made.
The same may apply for divergent.
When you are making a trio of movies, from the get go, there is huge profit to be had, if the first movie succeeds, which is why I think we shall see plenty more of these types of movies.
The other hugely profitable genre is super hero movies. And I expect plenty more of these.