You are suggested to not spend any coins after the fork until either chain integrates replay protection. I'm sure one of the chains is going to cave in and enable it.
I think that's unlikely. As much as the NYA signers want B2X to succeed, they don't seem interested in supporting it as a minority chain. Replay protection would only be introduced if they wanted the fork to survive (as an altcoin) despite having minority hash rate. Why would they do that? With majority hash rate, they can at least argue that B2X is the stronger chain. That doesn't make it "Bitcoin" to us, but according to most of the NYA signers' policies, it does.
At the end of the day, companies like Coinbase, BitGo and Blockchain want to see regular capacity increases to Bitcoin that simply aren't realistic. I can see why they are pivoting to altcoins. I just wish they'd do it a bit more peacefully...