At one hand I think Bitcoin Cash will either have an insignificant value or it will have overtaken Bitcoin as the number one cryptocurrency by the end of the year - and the first is much more likely than the latter; it's a very unstable situation when mining gear can be shifted between those two coins. With ethereum the difficulty level changes almost instantly, so when the Ethereum Classic split out the hash rate got balanced out pretty fast. With Bitcoin, if only 10% of the miners remain mining it, it will take almost half a year until the difficulty will be adjusted, so it will limp along on 10% of the capacity it has today. With the capacity already strained to the edge ... it means it will basically become impossible to transact for half a year. The Bitcoin Cash supporters are hoping that Bitcoin will die as the hash power defects to Bitcoin Cash. It is a quite dark vision.

At the other hand, I don't see any reasons why Bitcoin Cash should fall below Litecoin in market cap. From a market point of view, Bitcoin Cash does have some things going for it; since anyone holding bitcoins at the 1st of august now also holds bitcoin cash, there has been a big pressure on exchanges and other sites holding bitcoins on behalf of customer to implement support for Bitcoin Cash, hence it has gained some instant network effect. The other thing is that bitcoin holders are encouraged to get hold of their "free money", so many bitcoiners already have installed software for Bitcoin Cash. The third thing is that it plugs in very neatly in infrastructure built for bitcoin - even the bitcoin addresses can be reused. Perhaps it is room for it to co-exist alongside Bitcoin. We may be seeing that the difficulties will adjust so that the difference in profitability between mining the two coins won't be that significant, and that only some 10-20% of the miners will be jumping between the coins when profitability changes.