As someone who does almost all gaming on portable systems (I considered the GBA-thru 3DS to be my primary systems each of those gens, and PSP and Vita were in the top three the last two) the Switch still caters to me. It gets the same battery life as the Vita (It's actually slightly better on games that are always online), it's only slightly bigger. It can easily be recharged by a laptop caliber battery pack. I treat it as a portable that has the bonus feature of looking even better if I dock it at home at night.
It is a hybrid, but I treat it as a handheld and I'm sure there are plenty of others who do as well. It's definitely resonated well within the portable first crowd, so in a sense it is the true followup to the 3DS. It's also gotten a lot of talk as the followup to the Vita. It's also basically the redeemed vision of the Wii U, more or less. Take out the tv stuff and the asynchronous play and make it a sexy single tablet. It's also redeemed the Nvidia Shield Tablet!
It's a compelling piece of hardware in itself, but then to add the best first six month lineup of any console ever. The buzz around this reminds one instantly of the Wii.