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
Taiwan Semi Conductor has been producing 7nm since late 2016, Samsung is ramping up their current production now as well as Intel. Is there some reason to believe that these Chip makers would not sell to Bitmain? These are just a FEW of the companies with current 7nm production. Bitmain has proven time and time again that they are a very versatile and savy company. They just dumped a shit ton of 16nm units on the masses. Do you really think they have done this without a plan to replace their existing miners with the 7nm to gain the edge in mining??? Why would anyone think that?? You've got idiots in droves out there paying 5, 6, 7, THOUSAND dollars for D3'S from resellers that are now only making $45.00 per day!! It's fucking amazing how stupid this is all getting. OF COURSE BITMAIN IS BUYING 7nm CHIPS.....TODAY in SEPTEMBER 2017!!! YOU won't be buying the units with them in them, but BITMAIN WILL BE MINING WITH THEM LONG BEFORE THAT!!!!
Man, please stop spreading false info. TSMC is doing 10nm now and they have preliminary 7nm Risk Production but nowhere near the volumes required. 7nm volume is 2018. Plus, they're going with folks like Broadcomm and Mediatek that have numbers way beyond Bitmains. There's no excess production for asics there.
Samsung is late as hell and they'll have their needs to satisfy first.
Bitmain will scrap the excess cap, when and if available.
FACTS
2017
Samsung is already producing 10nm, Samsung is already trialling its 7nm process.
Intel is ahead in 10nm chips but Bitmain is not taking orders
2018
Samsung, Intel, TSMC, and Globalfoundries are all racing towards the goal of creating 7nm chips in mass production
TSMC is currently in lead, and expectation is mid-2018 for 7nm to churn out
GMO Japan is planning to buy 7nm for production of ASIC Miners
2019
7nm ASIC miner for sale
Generally smaller is better, as they are more efficient, use less electricity, generate less heat, and so on. 
or the dash price must dubble 
