[rcxdude]

I think there's still a wide range of devices for which a bare-metal or smaller RTOS approach is still more cost-effective. Anything that's simple enough it doesn't need networking, a filesystem, or a display, for example. Especially considering bare-metal embedded work seems to pay less than development on linux. But yes, embedded linux can address a huge part of the market and RT expands that a lot (though, of course, most people for whom that is a good option are already using it, it was a well-supported patchset for a long time)