Many are saying its a short term pump and dump.
Mining power has deserted BTC for BCH, but will return in a few hours when the change to hashing rate occurs.

https://fork.lol/pow/hashrate

although there are also rumours of Roger Ver dumping 25k BTC, I assume to put into BCH, which could mean your prediction of BCH dethroning BTC comes true

https://www.reddit.com/r/Bitcoin/comments/7cefom/roger_ver_just_sent_25k_btc_to_bitfinex/

its hard to call just now lol