I hope I can thank Lionel publicly here for making their cars available to 2 rail easily. I know this is not the forum. I just want to add balance to the discussion.
I don't mind having to buy the KD couplers extra. I actually hope someday you could offer full 2 rail RTR models. I will take what I can get as it comes. I don't expect Lionel to abandon the "claws" overnight. Someday they may not be desired anymore. We will have to wait and see.