The fact is, 32 bits suffice for almost every quantity we need to manipulate with computers. The exception, increasingly, is memory. We have hit the point where we are running out of address space.
It seems that 32-bit processors with 36 or 40-bit address buses could prolong the life of 32-bit (instruction) processors for some time. When it comes to computers, I'm always an advocate of doing things in a minimalist sort of way. :-)
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