The fact is that BTC is just the opposite to this day, despite SegWit arrival.
I hold BTC and no BCH. But I am worried that if this trend continues, merchants will start accepting BCH instead of BTC.
Will Bitcoin Cash some day be a threat to Bitcoin ?
The reason for BCH fast transaction and low fees is due to the low network congestion. Bitcoin network is way more busy than BCH network so that transaction time and fees are high compared to BCH. However, I don't think BCH can be a threat in any way to bitcoin because we have ETH in the market, which offers near instant transaction at a low fee. Also if you look at the market cap, you will understand that BCH failed to keep up to the expectation. Because when it started after the SegWit 2.0 in July, the BCH scored a market cap of 10 billion USD. But if you look at now, it's just 5.5 billion USD. The decreasing market cap shows the decrease in interest from the mass. So I think ETH can be a threat to bitcoin in future, but certainly not BCH.