If the offspring of any hybrid can live and thrive, then that's the best we can hope for since there will always be hybrids. And I hope that if someone does successfully cross a BRB with any sort of RTB and the offspring turn out to be sickly/cannot thrive, that people won't keep attempting it.
As human beings, we're curious people. We need to KNOW if we can do it. Granted, that's not always a good thing. I mean heck, everyone watched Jurassic Park, right?