Yeah, Grammie, this worries me.
I don't know how long they could have been studied (according to the hostess of the munchkin cat forum, they were developed by a vet who studied them intensely. The hostess states they have none of the problems related to dwarfism in all other species). I have a feeling that in years to come, physical problems will become apparent.
These aren't miniatures, they are dwarves. Cats with normal sized bodies on shortened legs. Since a cat's body is designed specifically for their mobility, long sleek bodies and long legs, I can't see how having shortened legs could benefit the animal at all. I see this as a fad. People re-designing the cat to suit their own needs to have something "different".
I think of horses. Miniature horses are just that-- horses that are much smaller than normal. A dwarf horse-- that is a horse with a normal sized torso, neck and head, but with vey short legs would have some drastic problems.
It just leaves a bad taste in my mouth