As cool as they look I also could not purchase one knowing that the gene is connected with a defect. Yes, they do fine in captivity, but the wobble is enough of a problem that it would not be viable in the wild - survival of the fittest - we can tease the gene out of them in controlled breeding, but in nature it would never pass on mostly due to hunting and escape abilities.
Lots of morphs would be disadvantaged due to lack of camouflage from our selective breeding, but leucism / melanistic creatures survive just fine naturally, as can strangely patterned animals. That does not effect mobility issues.
To be fair I also think brachycephalic dogs and cats (bulldogs, pugs, persian cats, etc) should not be bred nor would I own one. I also shy away from most "purebreds" for that reason in mammals at least. Golden Retrievers get cancer, boxers have heart issues, all doodles have a high chance for allergies... any highly modified genetic creature is bound to have problems when they have been tampered with to achieve a standard.
I'll take my mutts