Replaced by tablets (and phones). Now the demand for convenience has been siphoned off, laptops can settle into their natural form-factor (i.e. keyboard, adequate sized-screen).
As the proud owner and user of both a VAIO P and UX, I really hope they start looking at some of the smaller niche products again as they’re some of my favourite possessions. Even if they are occasionally impractical, being able to carry a laptop in my pocket with full sized ports for diagnostics is absolutely something I and many in my work community would be willing to pay for.
If you’re a fan of that form factor you need to investigate GPD (Game Pro Devices) and One Netbook, both of whom produce miniature PCs; GPD started with the GPD Win, a pocket console-sized PC with a 5.5” screen optimized for running Windows 10 games, then branched out with the GPD Pocket and Pocket 2, 7” screen subnotebooks (the first was a maxed-out netbook-spec PC, the second gen upgraded to an i3 processor) and now the micro PC, with VGA and RS-232 and a VESA attachment point (it’s intended for sysadmin/ops users who need to bolt a tiny PC to whatever they’re working on). One Netbook are a bit more consumer-ish, but do convertible notebook/tablet machines in the pocket size range. And both companies are now doing subnotebooks with 8-9” screens and beefier CPUs, in the 500-700 gram range.
You can find their stuff via Indiegogo (while kickstarting — they seem to use it to generate publicity rather than for primary funding) or on Geekbuying.com and other retail channels.
I always wanted one of these but times have definitely changed. The article says that the Crusoe is used to boost battery life, then lists it as 2.5hrs.