It is likely that most nodes will implement the Full RBF and here are my reasons:
What I am thinking too, just because if what you stated already, it will also help the mempool to be less congested as some people will be able to pump the fee.
But that is not what o_e_l_e_o is asking. Even 90% nodes signal for it and it, there will be a time at the start that just less than 50% nodes will signal for it and the dnumber of nodes that will be signalling it will be increasing. If it is 50% to 50% of the nodes that signal and that do not signal, that it is possible some transactions in the mempool of the signal node to flag the transaction as RBF whole those that did not signal will have the transaction as non RBF.
If a transaction has been flagged as RBF by a node, does block explorer has the ability to exclude it from transaction details? If the node you are connected has an RBF enable, that shouldn't be a problem with any explorer or is there going to be a change in RBF when nodes relay transactions within the network?
Yes, just like
https://www.blockchain.com/explorer?view=btc excluded it while some include it. The thing is it is possible an unconfirmed transaction which is non RBF will be flagged as RBF on some mempool (mempool of the nodes that signal for it already) and remain not flagged as RBF on some other mempool (mempool of the nodes that has not signal for it).