Yeah it's hard to see this happen. Since KSA has soften it's stance against Israel for a long time now and before this attack they were already advanced talks to normalise relations between bith countries like UAE/Bahrain and other Arab states did already. Hamas strike derailed and put this on hold. Some people even say Iran encouraged hamas to do so just to derail KSA/Israel rapproachment which according to many reports were at advanced stage. I don't think Iran is happy with KSA and other Arab states for talking and trying to make peace with Israel.A united Iran, Saudi Arabia and Turkey is a nightmare for the US/Israel/West.
Iran/KSA have just too many differences and conflict of interests but I think that's not enough reason for them not to talk at least to each other.