No it wont. Bitcoin's purpose or goal is to have transactions or payments with only the use of gadgets. Only digital currency but this bitcoin cash is the opposite. It still uses paper money for bills so i think it will not replace or even get to the level of bitcoin. The original one is better than bitcoin cash. But if the bitcoin cash's system will find a way to break out, there is a possibility that it might replace bitcoin but that chance is small like 10-30%. It now all depends on how these two will provide its service and lets see who is more efficient then will talk.