The ones who sold their BCH or bought into bitcoin for the first time after August are the ones feeling nervous. But seriously, this was always going to happen. Bitcoin's price rose too fast, and it has underlying problems with transactions. If they're not fixed, the market will jump to another solution. The chance to fix it was segwit2x. It's too late now.
I really hope no one is actually nervous about bitcoin right now haha. If they are they must be brand new to the game. BCH is a pump and dump coin. In a couple weeks it'll be back under $500 after people make their money from it, just like in August.
The idea that Bitcoin Cash offers a solution that Bitcoin doesn't is ridiculous. That is a very short term view of things. Also the idea that 2x was the chance to solve scaling for bitcoin... hahaha. I'm fully in support of the 2x in order to alleviate current stress on bitcoin, but it is a very short term solution. When bitcoin hits the mainstream for payments segwit2x or 8 MB blocks aren't gonna do anything to handle that! They'll maybe handle on-chain 1% of what is needed, probably less than 1%. The only solution that gets crypto to a mainstream payments platform are off-chain solutions, which Bitcoin is working on figuring out. Bitcoin Cash doesn't ever need to figure that out because they have 8 MB blocks that only get 0.1 MB worth of transactions per block because Bitcoin Cash is a pump and dump altcoin that isn't used for anything.
Have you seen the mempool? It's over 100k. It's ridiculous. And we know that bitcoin will never scale.
So the search is on for a replacement. I agree that there are many alts superior to bitcoincash - but some big names are behind BCH, and that might be enough to make it the winning coin.