How would i kno, maybe surprise us like Nintendo does best. Ex, who would of thought of 2DS? Cheaper to make which gives consumers an option of 3 to choose something more affordable and/or for a younger audience.
Giving us options are always a plus for anything really. I dont get why you think it would be a bad idea, anything can happen. Like off the top of my head, A PRO 3DS XL. Like you suggested gives an extra stick with maybe better improvements like grip, or much better extended life. For players that like MH (coming out in the West as well) and more importantly SSB? Can do a Pro 3DS XL Bundle with SSB?
Or something completely random? Anything can happen!!!
im not saying it cant have more revisions, im saying WHY would it need more revisions? why are we even talking about extending its life when its 3 years in?