That's true that the Switch was made for people who didn't bought a Wii U, but I also think it's smart to give the console something that would entice previous Wii U owners to buy it as well, therefore also increasing the amount of potential buyers for the system.
In this case, this is all hypothetical, but considering that the current library as it stands is primarily ports of games that aren't even that old to begin with, still being available to be bought in stores, with the upcoming games advertised being primarily ports, and with upcoming unique games that make the Switch worth buying that is far into the future, I'll judge on what the current library is right now, and I don't think it's a ripe time to be focusing on creating mostly ports. When the ports for various Zelda games came out, it was after the Wii U had a good library of games such as Mario Kart 8, Pikmin 3, Rayman Legends, etc. and even those ports aren't even guaranteed to be system sellers, as the Wii U had demonstrated.
I will change my opinion if further games get revealed, though. But considering all of this is not completely certain, my personal opinion will still stand until this happens.