I usually don't participate in the discussions on this fish, and I don't really want any. I wouldn't mind keeping real jellyfish, though! Maybe someday... But my take on genetically engineered flora and fauna is that we haven't been very responsible with this science. It could be very useful, if we were less wreckless about testing it. We have companies geared towards making a profit to thank for that.
Genetically engineered aquarium fish do make me wonder how long before this technology shows up in other pets... cats with dog genes and bunny/hamster combos. I imagine there will be more of a public outcry on these, as fish seem to be "pets that don't matter" in many people's eyes. Perhaps it is because they are inexpensive, fragile, silent, and non-cuddly, but humans seem to bond more with land-dwellers and have more opinions on how to properly care for them. Early bans on these fish will probably partially reflect politicians preparing for other animal introductions, which they would receive more public scrutiny over.