The MIPS instruction set will expire in 4 or 5 years. Everyone else is developing 8 cores, and you also said that you want to develop CPU, which is too backward.
X86 will be eliminated before the instruction set expires. . .
Now Loongson is adding a simulator that can run DOS system to the processor. . . (From what they say)
In fact, Loongson can also acquire X86 instruction set by acquiring VIA.