With regards to central America it's a very unbalanced echo system mainly because it's still in its infancy and the 3 rd wave of fish are only just making it up from south America, over the next few million years the fish fauna of ca will start resembling sa. Over this time many of the heroine cichlids of central America will go extinct as better adapted species from the south out compete them, this isn't helped by humans dropping fish from different continents into the mix as well but should we be trying to save fish that are naturally going to go extinct?
No matter how hard we try to preserve endangered or extinct species in the hobby we are all ways going to be line breeding them to a certain extent, hobbiest are always going to breed what they think is the best pair based on appearances. The A lyonsi I see today seem more colourful then the ones I saw ten years ago.
I don't actually disagree with you just bored at work and thought I would throw the other side of the argument out there.