Anything could change. Any given state is not just its leaders.
For example, I imagine many of the Saudi elites have sympathy for Palestine or may even feel a religious conviction to stick up for them. After all Umma is one of the key principles of Islam. So while MBS has stated indifference now, he may change his mind if he doesn't feel he has the support of enough of the rest of the Saudi aristocracy.
That's just a hypothetical though.