7nm chips are in production right now. Why do you think Bitmain flooded the market with their 16nm tech? Out with the old, in with the new. Ya got a whole bunch of dumbasses that paid such high prices for 16nm chips in their ASIC miners, that it will take them 1.5 years to pay the initial cost. Trust me, by then 7nm will be in full bloom and production. So bottom line....you don't know what you're talking about.
Maybe you can tell us what fab and what quantity does bitmain get access *now*, that is September 2017 to be precise 
I did understood that a Japanese company had created the 7 nm chip and will compete with Bitmain. They said not to chair there chip and start mining on there own in januari and later on offer cloud mining and equipment. This was all aiming to sha265, so i think the d3 miner is save until mid 2018, but thats speculating
