I'm pretty sure the Bitcoin Gold project was launched to discredit both BCH and B2X -- they all look like crappy altcoins now. As such, I think they will follow through with the time-tested and somewhat trivial address/transaction format change to prevent replay.
WTF
bch is crap altcoin
b2x is fckn dangerous attack on legacy bitcoin
We'll see how dangerous it really is. An attack, yes. Although I disagree with the characterization many make that it's a 51% attack to stop mining the legacy chain and migrate to a different network. A 51% attack is a censorship attack. If 90% of the miners hard fork away from Bitcoin, it's more of a "starvation attack." The intent/result is to starve users of transaction confirmations to incentivize them to use the hard fork chain.
If anything, this is an important test for Bitcoin. Is it still a decentralized network? Or do a few centralized companies act for most of the users? If the NYA companies are successful in co-opting Bitcoin, being a Bitcoin maximalist stops looking so attractive...