Believe it or not they still teach MIPS architecture and assembly in some universities (Technion, Israel for example).
There are still lots of markets that use MIPS. In addition, China seems interested in a national ISA and seems quite invested in MIPS. I wouldn't write it off just yet.
I would say that MIPS is the only ISA that has definitively proven itself in everything from tiny microcontrollers to multi-core, SMT (hyperthreaded) monsters that run most of the world's networks or the upcoming Chinese petaflop supercomputers.