Bitcoin Cash seems to be doing just fine with on-chain scaling. There are concerns about centralization on miners with it, but in my understanding the incentives planned in the original Bitcoin paper account for that.
Has it though? AFAIK it still has lower transaction volume than bitcoin.
Let’s see how it works out when adoption grows. If it doesn’t scale, then the timing for off-chain scaling will be more appropriate.
To give something to back me up, just look at the charts of BCH and it's main competitors: Litecoin and Dogecoin.
total # transactions: https://bitinfocharts.com/comparison/transactions-bch-ltc-do...
-> Litecoin does more than 2x the traffic of Bitcoin Cash and Dogecoin. Remark that Dogecoin sometimes handles more traffic than Bitcoin Cash.
Transaction fee: https://bitinfocharts.com/comparison/transactionfees-bch-ltc...
-> Dogecoin clear winner, Bitcoin Cash about the same as Litecoin (but remark that Litecoin handles double the amount of transactions)
So to be honest, I think Bitcoin Cash is just trying to ride the "Bitcoin" name, because for applicability, it doesn't seem to have any advantage over its direct competitors.