Well, I'm pretty sure someone will try to recreate them someday, maybe even pretty soon...
Manipulating Genes has never been so cheap ever before, and a lot of People already have started creating Photoluminiscent Plants and a Protein that makes you able to
see in the dark like a cat, so why not?
I just think doing so might come at a high Price, for example, Artificially created Ponies could have a massive impact on our world's ecosystem.