It depends how long Nintendo support the 3ds, the new 3ds should help boost hardware sales but Im not sure it will do much for software sales(mostly due to people upgrading their consoles rather than buying a new console), and the wii u is still too expensive, it needs to be at the most 199, but still the ps4 will beat the 3ds by a lot so it will really come down to how close the 3ds can stay to the ps4 and if the wii u can pass out the vita and by how much but I reckon the gap will be about 20 million in 4 years
old skool







