The Arabs will probably prevail in Yemen but it is the only one of Iran’s wars where Iranian prospects are good. Iraq, Syria, Gaza and Lebanon are all more expensive and less likely to provide the Iranian theocracy with a much needed victory. That means the growing domestic protests will become more of a threat.
And Iran's prospects are good only in the sense that Westerners are falling for Iranian propaganda that portrays Saudi Arabia and not Iran and their Houthi allies as responsible for civilian casualties.
Although given that many Westerners are primed to believe anything bad about America or one of our allies, this isn't an issue to praise the sophistication of Iranian propaganda but one to highlight how easily some Westerners will believe the most obvious fraud if it makes America look bad. But points to the Iranians for recognizing and exploiting that, I suppose.
Fortunately, America is trying to topple that house of cards rather than prop it up. With America squeezing Iran financially again, this will be harder for Iran to afford. And Iran's people are already tired of the expense and casualties of the mullahs' endless wars for empire. Iran's bad prospects abroad may follow them home. Iran is a multi-ethnic rump empire, remember, with a whole lot of non-Persians ruled from Tehran.
Can Iran's nutball mullahs go two more years without pallets of cash arriving?
Honestly, this is how I feel about Russia's fights in Syria and the Donbas on top of hostility towards America and anybody on their western border. All give the illusion of making Russia great again but they just might lead to a smaller Russia.