I'm also curious as to what is going to happen when (for example) 50% of nodes have enabled full RBF, 50% of nodes have not enabled full RBF, and I try to replace a transaction which is opted out of RBF. What about if I'm using a hot wallet and not my own node? Will I have to connect to different servers to find one which will relay my replacement transaction? And then presumably some block explorers will show the original transaction while some will show the replacement, and I'll have no idea which one will actually get mined until one of them is mined?
If you use light wallet and managed to connect to server which relay full RBF transaction, it's likely your transaction will receive on miner mempool. Each node connect to at least 8 other node, so in average 4 of them will continue to relay your transaction.
Yeah, it's a somewhat bad news for the services that were boasting 0-confirmation deposits. But they can use LN now.
It's also bad news for user who only occasionally spend their Bitcoin on such services. It's unlikely they'll bother use LN wallet or lock their Bitcoin on LN channel when they only make transaction once in a month.