It's easier than trying to come up with some soft of definition for an "open system" or a "real computer".
I dislike monopolies more than most, but MIPS isn't currently a very strong contender for ARM's market share.
Also, don't dismiss them. My last company was a startup producing a portable native gaming platform. I did a couple of ports to some MIPS-based smart TVs, and it totally rocked; I think we ended up with Lego Batman running on it in HD with an XBox 360 controller plugged into the USB diagnostics port on the back.
Of course, at the userland level all these platforms are horrible piles of fail. The ones I've seen all run badly-ported Linux kernels, and on at least one they hadn't bothered to write device drivers, and as a result the TV UI stack did audio by talking via pipes to a standalone executable, running as root, which fiddled with the hardware registers. Unsurprisingly we had latency problems...
Out of interest, what did you use for your base OS when you were doing MIPS development? Did you reuse an existing distro? Does Linaro support MIPS?
EDIT: Just found out there's a Linaro-like organisation for MIPS called Prpl. Is that what you used?
I vaguely remember Linaro, but that might have been ARM (which we also supported). I don't recall Prpl.