Can you ask him what other things Bitcoin cash is working on to scale in the future? Sure they went from 1MB blocks to 8MB blocks, but it's only a matter of time when it too is not enough?
Also, today we mainly buy BTC in order to buy the other cryptos. When will we be able to use BCH on all exchanges to buy alt cryptos? I ask this because this would be the best way to win for him. Give people an alternative that is cheap and fast to transact and easy to use when buying alt coins. I mainly only buy BTC today so I can make an immediate purchase with it of another coin. I hold only a small amount as an investment.