What will happen in
BTC bitcoin market when another fork hits bitcoin, results in emerging bitcoin gold as new coin
Will price of bitcoin go down
Will new coin get popularity like bch

I think as well that it will not have any impact on bitcoin.
One reason is that most people have no idea bitcoin gold is existing.
And for those who are aware of bitcoin gold, to them it's clear that somebody wants to make quick money and is trying to advertise with the brand 'bitcoin'.
I really hope that it will be a big failure for the forkers. Too many bitcoin-coins are gonna spoil the stew.