To be honest, they could end the 3DS today and it'd still have enough awesome games to last another few years. There're also a ton of DS games I haven't got round to.
As for up and coming games. Fire Emblem is the main one. Then I'll be waiting for localization announcements for Bravely Second, Final Fantasy Explorers and the recently announced Dragon Quest 8. Especially Dragon Quest, I never played that and have repeatedly read it's the best in the series. Hope they add C-stick camera controls.