Saudi-Iran war Imam Mahdi?

If you've followed events in Yemen recently. Houthis and allies are now in control of most of Yemen. At one point Saudi Arabia threatened intervention. Houthis responded by saying they will liberate Hejaz if that happens and end the Saudi regime. At same time, Iran doesn't like Saudi Arabia and wants revenge. If something happens causing a clash, shia in saudi Arabia can revolt but also Houthis might invade. Meaning there is high possibility that of violence in Saudi Arabia. There is also hadith that right before Mahdi emerges, tribes will shed blood in Saudi Arabia. Is it possible that this is our time and if such war occurs then we should expect the Mahdi? Shia really want to invade it.