Total hash is presently over 500 petahash so in the next months you will hear the term exahash (EH/s).
You have failed to take into account an important factor. As the diff rises and BTC/USD doesn't increase significantly or goes down older miners will be forced offline, I doubt we will see exahash in the next 6months-1year unless ofcourse BTC/USD doubles in price (Quadrople @ Halving).
Difficulty just increased by 10% and the next increase is predicted to be similar.
Doubling time to get to 1 EH/s from here:
10% diff increase every 14 days = about 100 days
7% = about 140 days
5% = about 200 days
Yeah, I think it´s highly likely that you´ll hear the term exahash in the coming months and it seems a given that total hash will be there in - say six months? Any shipping backlogs at Bitmain?
Sure its possible that Bitmain will sell 100,000 S7's to take the diff to 1EH/s taking every miner out of profitability including S5, thats around 388PHs out of profitabilty and likely to shut down (Aug 22 2015 54,256,630,328 2.95% 388,384,088 GH/s) so that requires another 80,000 S7's to be sold to replace the shutdown miners
I highly doubt it though, unless BTC/USD gets a huge boost.
You may want to compare this chart to that of bitcoin since early 2014. If I had a bitcoin for every time I´ve heard that bitcoin needed a special boost in price for hashrate to increase I´d be a billionaire
