I think people in politics who are effective/successful, or at least somewhat those things, tend to deal with the situation before them, or the realistic possibilities that appear to be on offer. If that includes BJ as PM they are just going to get on with it.
That's not going to be an absolute, most people have a line, but I don't think idealists are usually all that effective in politics.
I think the party has decided BJ is a liability and they need a replacement in good time to reset for the next election. He may kick and scream but if they want him gone I think it will be quick.