"Before a handful of people made a vague agreement for segwit2x, 45~50% of miners were signaling for bigger blocks for months, while segwit languished at 30%. "

This part is very important. A lot of FUD has been spread over the last few hours about how the BCC chain won't have any power behind it, but given how many of the miners were signalling for bigger blocks in the past, I would say it's very likely that the BCC chain will have a significant hashrate when it launches.