So, Chrome has WebGL on by default ... if you have hardware OpenGL 2.0 support, so far as I can tell. Well, I suppose modern Direct3D support on Windows would also suffice, given their ANGLE compatibility library.
One of the Linux computers I use regularly has no such support, so WebGL content doesn't render at all. Said computer is a little over two years old, so I suspect I'm not the only one with problems.
Saying "Sorry, the web doesn't work on your fairly modern computer" isn't good enough.
Until WebGL just works on everyday computers and handhelds across Chrome and Firefox and Safari (and Opera?), it's a no go for me.
Anyway, if I'm misunderstanding the state of Chrome WebGL support, let me know, but for now it's just vaporware in my book.