So what's the difference between a hobby miner with one ASIC and a "pro" with 250+ ASICs... and your one GPU gamer and "large" home miner with 250+ GPUs?
I think there is a contradiction between your stance that ASICs "centralize" coins when you accept that 250+ GPU "home miners" are ok. That many GPUs is a business, not a hobby.
The difference is GPU miners are not competing against the damn manufacturers. Whereas hobby and 250+ ASIC miners are competing against the damn manufacturer. It's just a matter of time and ZEC will be the same as Bitcoin in regards to ASIC mining.