MIPS sure didn't, same for SPARC. CPU architectures can effectively die in a handful of years just like MySpace, Delicious, Digg and such.

MySpace is dead, dead. You'll still find devices, especially in manufacturing, that are still running on a MIPS, and are essential to the process. You'll still find them in various cheap toys on the shelves.

MIPS _should_ be dead, half the manufacturers of the chip have stopped. But, Imagination Technology still sell a considerable number to Apple every year.

Even decades after starting to decline both are still less dead than the average former social media fad.