I owned the 12" PowerBook G4. Ordered it first week after MacWorld 2003. That laptop had everything - a full set of ports, a stellar keyboard, an optical drive, and a processor that was nearly the equal of the entry level 15" PowerBook at the time, all in a footprint that was the same size as a sheet of paper, making it oh-so-easy to pack in with college supplies, or use in coach. But its time came and went, and vainly hoped that Apple would release a comparable follow up.
The MacBook Air 13 legitimately had a footprint that was too big - 13" screen and giant bezels meant it was too deep to comfortably use on a plane.
The MacBook Air 11... too short a screen (vertically) to be comfortable using.
Then the MacBook was announced. Crisp screen, small size... but one port? Actually, 0 ports if plugged in? And not even TB? And that keyboard that had no travel (and we'd later find out would stop working)? Sigh.
The current MacBook Air is, I think, the pointless product. It has the same footprint as a MacBook Pro, but in a wedge shape and without a fan. Really, what's the point? It's not like you're saving much weight with it, either.
To get me interested in a MacBook 12", it would need to have the same ethos as the PowerBook 12: 90% of the performance, 60% the volume. And preferably the same footprint as a sheet of paper. That means 8.5x11" (the PB12 was 8.6" x 10.9"), a working keyboard, an M1x or M2 chip with 16GB RAM, and four TB3 ports - if I'm in an AirBNB for a week, I want to be able to leave the laptop plugged in on the desk, with a mouse, and still have the option to plug in an SD card reader or external display if needed (without a whole breakout box).