To start I should say I don't think any coin can or should replace Bitcoin as the most dominant coin. Bitcoin started it all and we all trade and measure our portfolios in BTC. It has the recognition of casual investors and when the Lightning Network goes live the problem of moving it will be mostly solved.
However, if it were to be replaced, Bitcoin Cash is a pretty shit candidate. It offers nothing new. The only reason any of us pay it any mind at all is because it has "Bitcoin" in the name. If it were not for this, we'd all be scratching our heads trying to figure out why it's worth nearly $3000 (something which I don't think will last over the coming years, people will wake up and realise how unremarkable it is). It's value is almost entirely based on a few, very rich people pumping and manipulating it, something that could stop when they get bored and realise they've thrown enough money away on it.
If any coin should "replace" Bitcoin - it should be a coin that's its own thing. Coins that bring new features to the table. Apart from the obvious big candidates that are more useful than Bitcoin and BCH (Eth, Dash etc) there's coins which really could be far more-suitable for mainstream use.
Chief among them I think is Raiblocks. Despite being traded on very shitty exchanges (which it melted
) it's managed to become a top 20 coin. The main reason is no-fee transactions and low CPU-power footprint.
From the FAQ:
WHAT IS RAIBLOCKS?
RaiBlocks is a trustless, low-latency cryptocurrency that utilizes a novel block-lattice architecture, where each account has its own blockchain and achieves consensus via delegated Proof of Stake voting.
Offers feeless, instantaneous transactions, as well as unlimited scalability, making RaiBlocks ideal for peer-to-peer transactions.
The network requires minimal resources, no high-power mining hardware, and can process high transaction throughput.
To date, the RaiBlocks network has processed over four million transactions with an unpruned ledger size of only 1.7GB.So rather than the big blocks vs lightning network war, Raiblocks is good tech that solves all of the problems related to sending or withdrawing cryptocurrencies from exchanges (despite recent problems related to a malfunctioning node). And while it's not exactly a low-maximum-supply coin, its supply of 133,248,290 XRB is low enough for it to act as a store of value. If it were listed on decent exchanges (Binance coming soon?) and if you could trade other currencies with it, I could see people doing all of their trading in Raiblocks. If for no other reason that it will be free to move around.
There are also other far better candidates than BCH. An outsider like Phore could also shake things up, especially when their marketplace (currently in closed beta) goes live. Marketplaces drove the early gains of BTC and Dash. With atomic swaps and smart contracts coming soon it could be an all-in-one coin which continues to shake things up (recent 10x growth).
Tl;dr:
Basically there's hundreds of better "Bitcoin replacement" coins than Bitcoin Cash, many of which actually bring something new to the table, so Roger Ver can suck it.