I traded in my Thinkpad for a Pixel. The Pixel is the only laptop I use. (I would say it's the only laptop I own, but my apartment is a veritable computer museum and several of the specimens are laptops.)
For me, the biggest problem with laptops is keeping them sync'd with my desktop. I could use a laptop as a primary computer, and with better expansion options than previously exited (USB3, dual Display Ports, etc.), but I still find laptops limiting, meaning I only use them when I can't have my desktop. My desktop has 6 cores, 4 drives, a high-quality sound card, a real serial port, etc. These things are all important for what I use a computer for, most of the time, and a laptop just isn't good enough to be my only machine.
Chrome OS solves the synchronization problem for me. The configurability is restricted more than my average Linux box, so there is less to concern myself about setting up. My browser settings and extension sync, the desktop background syncs, etc. I can take a brand new Chromebook and be up in running in 5 minutes.
That's the value proposition of Chrome OS for me. Once it is up and running, I can ssh to a real computer and browse the web, which is what I'd do with a ultra-excellent billion-core superlaptop 99% of the time anyway.
The other 1% of the time, I'd like to use a laptop for portable software-defined radio applications, and as it stands, Chrome OS is terrible for that. But since Chrome has APIs for talking to USB, serial ports, and audio, I'm actually working on supporting controlling my radio and analyzing the I/Q inputs as a Chrome packaged app. The advantage for me is that I'll have SDR functionality on any computer I encounter: you can install packaged apps from the webstore on Chrome OS, Mac, Windows, and Linux, and everything will Just Work.
Finally, the Pixel has the best screen I've ever seen on a computer.
Anyway, Chrome OS is nowhere near its full potential just with the APIs available today. I think as more developers write awesome web apps or Chrome apps, more people will use Chrome OS, further incentivizing developers to create even better non-desktop apps. But as it stands, I am 100% satisfied with the Pixel as my primary laptop, and I imagine many other people are too.