It probably still pumped like another coin just like how old coin pumped, but i dont know how long bitcoincash would stay on the market since its purposes isnt needed anymore, BTC with its Lightning Network already a good combination.
If you look in that aspect then you do not need hundreds and thousands of other coins in the cryptocurrency market but still they are all riding high whenever the bull run starts. I am not certain about the development of BitcoinCash as i am not following their development for years but it will rally as long as the Bitcoin market rallies.