Bitcoin Cash fork is a smart hedge against what looks like a potentially faulty implementation for Segregated Witness. Read I Looked Into Segwit And Here Is What I Saw by @modprobe.
A great point that @modprobe made was that this Segwit change is permanent. Love it or not, the proposed Bitcoin change could cause a lot of economic and political damage if its not done correctly.
Bitcoin Cash will effectively preserve the Bitcoin of today and solve the scaling issue a less sophisticated way (some might say simple way), but also less risky and with a much lower possibility of exploitation by hackers.
Given this, my prediction is that non-technical folks will not understand the meaning behind the fork and will see no reason to move to Bitcoin Cash other than mere speculation. Bitcoin will move forward with the Segwit change and everything will hum along just fine with Bitcoin leading the charge on the crypto-currency of choice. IF the Segwit change works well and solves the problems of the day, then Bitcoin Cash will fade away becauase we wont need to go back to the fork. If Segwit creates an exploitable hole in Bitcoin and is found to be the culprit of a big enough coin heist, then Bitcoin Cash value will spike over night and Bitcoin will die out.
I'm no economist, just a developer. I see this fork as a fallback and potential preservation of pre-segwit Bitcoin should this Segwit change fail.
Bitcoin cash may reduce the current value of bitcoin. This is similar to the case of Ethereum and Ethereum classic.All analysts are convinced that the bitcoin will rise.Many will begin to sell bitcoin to cash as quickly as possible, in the first few days of trading. Others will want to buy at a low price. The auction will be interesting.Good luck