Take for example the next halving block reward for example , In July 2016 when the halving happens if Miners see that they make no profit anymore with the 12.5 BTC per block then they will shutdown their miners for good and we are screwed .
I am more worried that Bitcoin mining will become less profitable in other countries and only profitable in China. This will seriously influence the security of the whole network, if all
mining is done by Chinese mining farms. We do not want centralized control over any aspect of Bitcoin, especially in the mining sector.
Let's hope the price increase enough to cover for the reduced reward, after the halving.
So what if it's only in China ? Bitcoin is digital so I don't see how this is a problem since they can be transfered worldwide , I'am pretty sure that not all bitcoins are being sold to Chinese people .
It's a major thing, because any political decision could shut down a whole network, if all mining was centralized in one geographical location. The Chinese are already subjected to
very controversial censoring and firewalls on internet traffic. It's not about the location where it's bought or sold, it's where it's created/mined and the calculations being done
to confirm transactions for everyone. Bitcoin is nothing without mining.