Of course Bitcoin is already broken, because the Chinese mining cartel controls 65% of the hashrate and they lied about the Great Firewall of China being a problem[1] because they really want to veto block size increases so they can maximize their profits via spiraling transactions fees which I predicted in 2013. And remember my point that on the next block reward halving (this year I think) then the lowest cost miners will survive and the marginal miners will lose profitability and thus China's 65% share will increase significantly. I also believe Chinese miners are operating with near 0 cost electricity with a "wink and a handshake" charging the electricity cost to the collective society.

[1]	We know they are lying because they can put a pool abroad and send only a block hash across the GFW thus bandwidth is not an issue. They are clearly lying!