"bcash" as you call it really is more like the original Bitcoin than bcore. The whole chain split and scaling debate shouldn't have existed, the 1mb limit was only put in place as a temporary measure to stop spam early on in Bitcoin's life.
And while it would be welcome to increase capacity, there are many ways to do that. Coinbase fixing their broken wallet would single handedly give more spare capacity than any other measure right now. If their customers would instead choose a service where you pay low or no fees we wouldn't have the fee spikes we have right now. To argue that a globally coordinated rule change is somehow the easy way out requires some very good explanation.
That said, it might be prudent to mention in this context that we activated a blocksize increase only a few months ago. The opt-in, non-coordinated kind, which you are free to use at any time. (Unless you are with Coinbase, of course. In which case, see above.)
There are also other real life examples too, of single wayward services that made the blockchain harder to use for everyone, such as the casino which recorded a transaction in the global ledger for all eternity for every dice roll. Those are all priced out now, together with some of the more excessive tumblers, but that solution could be considered crippling the network.
Are there "too big to fail" services within the Bitcoin ecosystem? Matters are complicated further by the fact that the exchange in question foot the bill to their customers, one customer at a time, so the economic impact for them is negligible.
Why "fail", then? Well, it turns out that somebody looked at their hot wallets recently and noted that the mostly inappropriate choices of transactions to make had resulted in a non trivial amount of non-spendable dust collecting. In a bank run situation, that would result in them not being able to fully empty their wallets. The further down we investigate, the more there is to learn.
the segwit2x fork was planned for AFTER the bcash/bch fork. also, there were 2 issues at the time: block size increase and segwit implementation. the segwit2x fork didn't occur, so everybody is pigeonholed into either [yes blocksize increase, no segwit] or [no blocksize increase, yes segwit]
There are literally 1000 other cryptos that move money. BCH was never needed.
Also, ETH is the Bitcoin 2. BCH isnt used on exchanges, ETH is.