As Tim Olson had previously pointed out (and with the new Zcash sponsored bounty for a GPU miner) if any large ethereum miners switch to Zcash it may destroy the dream of CPU mining for this coin. I would like to have a discussion of whether this claim could be true.
With Tim's test we saw a large speed up in efficiency for GPU's and I know many ETH miners have 1000's of cards due to Ethereum's memory hardness resistance. Would having a single one of them switch over create complete centralization? Why or why not?