The Martells are my favorite house bar none (****, they're on my avatar here) and I am pissed they technically don't exist anymore. I agree they could have gone about changing it a different way, but it did have to be pretty different to account for other changes from the books. It seems they transferred the strength away from Doran and gave it to Ellaria, and I am curious where they go with it from here.
I guess I am still just so happy with how Oberyn was portrayed and how faithfully they stuck to his story that I am not as worried with how much they have changed the story of what takes place in Dorne itself. But I get where you are coming from, for sure.