The physical form factor is still around today, if you want a notebook PC that's smaller than an ultrabook. Current flag carrier is probably the GPD P2 Max from Sheznhen's Gamepro Devices, a firm who started out making linux-based handheld game consoles around 2013 then branched out into netbooks. The first GPD Pocket stuck a maxed-out version of the Intel netbook spec sheet in a machined aluminum body with a 7" scre…
One thing I will say is that, these tiny devices never fail to seem magical to the general public. I own (and from time to time use) a OneMix 2S Yoga, and even in this day and age with our smartphones and thin-and-light laptops, every time I pop it out on a bus or plane or at a conference, countless people strike up a conversation asking me what "that tiny laptop(/macbook*)" is...
* With the lid closed, the all-aluminum build does make the onemix 2s look like a shrunken down older Macbook Pro...