I doubt we'll see mainline Pokemon games on eShop. Why would they do that when they know we'll pay eight times the price for remakes?
I certainly don't see them selling two different versions; if anything, we'll get Crystal as opposed to Gold and Silver.
Spinoffs are fair game, though; I want TCG and Pinball, please.
Let's be honest, they ain't remaking Red, Blue, Yellow, Gold, Silver, or Crystal anytime soon.
I also don't think it will happen but I don't see these six games hurting sales any.