Well, Chromebooks do linux, sort of. And they are pretty fast, sort of. It would be have to have a hardware that's faster and supports full OpenGl. Nvidia does have their linux for Tegra thing. But yeah, better software would definitely be nice, too.
They're also super cheap, super light, and have super long battery. And ARM is interesting. I've been liking it since back in the day hacking on the Game Boy Advance.