28 Jun 2015, 20:12
My first thought is that "how is a FPGA reimplementation any better than a software emulator?"
Both are going to be inexact, but this has the added drawback of being expensive.
Think of all the "NES on a chip" designs that went into cheap knock-off consoles and other inexpensive games. They implemented the hardware, but did only a passable job of it. (some cartridges aren't compatible, some have funky sound, etc.)
While there is the chance the FPGA models could improve, I'd think you'd get faster and better results piggybacking on all the people doing emulation on normal PC platforms. It also gives you potentially more resources to work with-- if you have a Raspberry Pi, you might need to run a weak emulator like SNES9x, but if you have a fire-breathing desktop, you can use a different approach like bsnes.