It is a real threat to Bitcoin in many levels. BCH is weaker and still have no chance, but he is there.
Well said, Bitcoin cannot be easily replaced by any Altcoins especially Bitcoin Cash, although Bitcoin Cash has been sending a good message to the world that any Altcoin has the potential to be the next Bitcoin and can surpass Bitcoin in terms of value but they're still need to walk with Bitcoin's shoe. Bitcoin's has been into hard times but Bitcoin Cash is now marching to Bitcoin's tail. Hoprfully everything goes fine and we're really excited for about to happen.
This is very interesting issue that need to address to enthusiasts because anytime soon the next Bitcoin will rise, is it Bitcoin Cash, Bitcoin Gold in the group of Bitcoin Forks or from the Altcoin group that leaded by Ethereum.