I don't think Bitcoin cash can ever take bitcoin place after the fork even if it will be supported by the next hard fork or Segwit2x it is because the market of bitcoin is very strong nowadays it has build its stability and trust of people, many are now working to earn bitcoin and also investors are now moving their heads towards bitcoin which makes it the most strongest cryptos in the market. Bitcoin is considered the mother of all crypto currencies so no matter how they tried introducting different kinds of coins bitcoin will remain in front.
BTC is king forever and there is no place to another king. May be some coins could get close to it, but take first place is unreal. All new investors in crypto come here for BTC and only after that they take look at others.