It all depends on their ability to release titles for their biggest franchises in the first 2 years. The Wii-U had an incredible head start over its competitors, but it didn't release anything worthwhile until the Xbox One and PS4 were already out. While I'm a Nintendo fan, there's no way in a million years you can compete with Halo, Destiny (lol) and GTA V with just remasters. They only really put effort into trying to sell trash fanservice: the game. Yooka Laylee and Breath of the Wild will give the Switch a strong start, but if we don't see a Metroid, Star Fox (that's not yet another Lylat Wars reboot), Super Mario Galaxy, Donkey Kong, F-Zero or willing third party titles out and about before 2019, it won't be good enough on their behalf.