While I do not keep African Cichlids myself, so I have not felt the pain of this personally...
A couple of species of Rift Lake Cichlids ae no longer available to the hobby as pure species, because all of them in the hobby have been hybridized and we can no long er remove them from the wild.
I bet 99% of the people who allowed hybridization of those species argued just like you guys saying that no long term impact would be had from their actions.
Hind sight is 20/20 but sometimes it's to late to look back....