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.