The way bitcoin is train is going it will be hard for bitcoin cash to stay above $300. I personally Believe that We won't see total disappearance of bitcoin cash, its just not possible unless all miners agree to abandon it and all users decide not to use it ever again, The chances of this happening are very slim. Bitcoin's fork will always have some value just because they have bitcoin attached to it. Many will use this name for scamming purposes especially in the developing countries, imagine scamming people by giving them bitcoin cash instead of bitcoins. This will always keep a market for Bitcoin forks imo.