How is 70% of the mining power directed at Bitch Coin? Did Bitmain hijack every Antminer on the planet? No miner in their right mind would voluntarily mine that crap. How did they get that much of the hash rate?
This was a well orchestrated plan by a few and the majority will follow IMHO
It's only the beginning...
Disclaimer:I'm only right 67% of the time

Even if the majority did follow, there would be a lag of a few days at least. The swap of mining BTC to Bitch was almost instant.