I think that once bitcoin gold comes out, we are probably going to see a decrease in the price of bitcoin cash, as we are going to have another bitcoin like alt who is going to be fighting for the same market share, not going to be so easy for bitcoin cash to fight both bitcoin and bitcoin gold, if I was an holder I would be selling my shares for bitcoin.
the only reason bch is a big deal is because they cleverly aligned it with the threatened chain split and it's backed by bitmain and all the usual hijacking pricks.
bitcoin gold will be a pipsqueak with no momentum. it won't have any impact.
I wouldn't say gold won't have any impact maybe not quite the same as cash but then again they are competing in different spaces gold is really competing against other GPU coins
The biggest threat to cash is segwit2x because a lot of current cash supporters are also big B2X supporters there have been many polls run on twitter and most end up close to 50:50 for which chain they will support