If they can get the talent for it, then why not a 115lbs division? That would be off the hook! Hope they can make it happen
Because there isn't talent for it.
5'2 athletes are quite rare outside of Asia and 3rd world countries.
The only notable straw I can even think of is Rambaa Samdet and IIRC he's fought at fly before and should if he plans on making a serious MMA career.