It would be interesting to see some hybrids. I would imagine in the wild where some species overlap it is possible to have occured naturally. I wonder how reliable the whole sterile males thing is though.
On the flip side I don't know if I would want to see the market go that way. I use to breed clownfish a while back. Years ago any kind of misbar or deformation was considered no good. Now a breeder putting out pure species standard specimens is the one considered to be breeding undisirable specimens.
I would like to see more color morphs, but without the cross breeding.