16-bit address and data buses? Hardware multiplier, divider, and barrel shifter? I wouldn't exactly call it simple. The cost to build one out of discrete logic probably approaches the quadruple digits.
Magic-1 (http://www.homebrewcpu.com/) is a 16-bit, microcoded homebrew CPU that took about 4 years to build, and it doesn't have any of the above features.
Who will implement a DCPU16 in Conway's game of life?
Seriously though, the fact that we're able to ask questions like this is a breath of fresh air... as a market, Notch has done a hell of a job appealing to us.