Blazkowicz
Legend
But if you count all devices that have a processor, we see that the vast majority has no operating system whatsoever (tiny microcontrollers). Of all the devices that do have one, by far the vast majority uses an Unix derivate, most likely a custom Linux. Most of those are invisible. They're inside random electronics.
I'm not so sure about that, they often and by a great deal use a proprietary OS like VxWorks or QNX instead. Or something else entirely.
You say you might want Bluetooth, USB etc. but you can as well use a lighter simpler OS to get the stacks, no need for luxuries such as two megabytes of RAM and multitasking support.
Just saying Linux runs 90% of embedded (or some vague amount like "vast majority"), even considering only the embedded applications that run an OS, is dubious to me. It's something I've only ever read on Slashdot.
I also don't really agree that Android does something for me. It's all proprietary beyond the kernel and is like Windows RT, same kernel as desktop Windows, everything different and incompatible. The one positive thing I can think of is Ubuntu is writing a display server that can use Android drivers, so you will be able to run desktop linux on more ARM/mobile devices or run it better, one year from now.