GBA games were still being made during the first 2-3 years of the DS and they were even BC, so why can't digital eShop versions of 3DS and possibly Wii U games be the same?i think wii u and 3DS will still being sold for few years. you may have noticed it, this gen (8th) still sell previous gen console(7th)
so maybe nextgen (9th) will keep selling 8th gen console...