the way things are at mo they should defo continue with the 3ds and future handhelds.
with nintendo they gone a mountain of old games and with everyone now owning smartphones perhaps the next step for ninty is to make a phone which has an nintendo e-shop to get nintendo games.
as for the wiiu id make that the last console.....stick with it a couple more years and if it continues to struggle and making a loss then end production.
make games then for the ps4/x1 but stay in the handheld/phone market. Nintenphone anyone?