Now that you mentioned it. There will be a war between Syria and Saudi Arabia when Mahdi will be consolidating his position in Saudi Arabia. Syria will be under control of a Tyrant as usual
. Syria will be defeated.
Romans will destroy two Islamic armies but will return after a treaty.
Jesus PBUH will be able to correct religious misconceptions of all believers perhaps. I do not think it is possible to wipe out jews in the manner stated.
Tsarists attempted to do that. Hitler attempted to do that. Arabs attempted to do that. All failed. It is important to learn from real developments and history.
Islam spreads with guidance and examples, not with violence. Prophets can do a better job in this matter of-course.
Only Allah Almighty knows what will happen in the future.
Back to topic now.