no, bitcoin cash will not replace bitcoin, there is no special about bitcoin cash its just like normal altcoin to me, many speculation like that this other alts that may replace bitcoin but its now 2017, no other alts can replace bitcoin until now since bitcoin was made, bitcoin is a mother of all coins if there is no bitcoin will no altcoin will be born.
I agree this coin is just like a other altcoin. Bitcoincash may have a good team, but they are not the main coin and it will be always like this. Bitcoin will still be the best coin in the world.
If every country bans bitcoin. Bitcoin would collapse and maybe Bitcoincash could take over his place.
There are no relation between Bitcoin and Bitcoin Cash so the values are just within each coin and every cases that may affect the crypto world will only affect due time but both currency have their different supports and marketing. The good thing about Bitcoin Cash is the value that can compete Bitcoin's value, this is the message and hope for Altcoin and investors that someday their investment will have a good profit also. Bitcoin Cash isn't accidentally rises but it's because of its support and marketing that working hard to promote their coins.