I expect for a couple of more years for 3DS domination. They have the chance to assess their options for their next handheld, plan out the games schedule while releasing some great games every couple of months and getting 3rd parties to fill the gaps. The 3DS' library only got so good a year ago in 2013, and 2014 has been somewhat disappointing so far (but will pick up near Christmas to guarantee lots of sales) so they need to build up 2015 with another new IP, revive an old loved IP like Metroid, make another remake like Majora's Mask 3D and release a major Mario game or something similar with one of their biggest IPs. Do something completely unexpected and get TONS of 3rd party wrapped up for 2015 and 2016.