Its a gimmick to me if the software doesn't back up the hardware a la Wii U, Kinect, PS Move controllers - to me, it was just a platform for regurgitated software with slightly different controls added on. 1st party at that. All promise, poor universal execution.
And as far as the Tegra x1, unless its heavily modified, I doubt it will approach Xbone and PS4 in terms of raw horse power - but that isn't the important part, its the software that I have issue with.
Wii U tablet is excellent and still used often in my house. No where to the level of Kinect or Move. Switch appears to be the next logical step to that. I can see it being it hit with many families.