A Linux phone (running open, non-custom software in both the kernel and user space) is in fact comparatively easy - we sort of know how to get there, it's just

A Linux phone (running open, non-custom software in both the kernel and user space) is in fact comparatively easy - we sort of know how to get there, it's just a matter of work. But that, while quite desirable indeed (in that it would mean true "convergence" between desktop and mobile platforms, at least for power users) is only a small part of what the article talks about.