World Wide Jihad is funded primarily by Qatar and Saudi Arabia. Not Iran. Iran is one of the funders of specific groups. Most of the jihadis we deal with are Sunni.

Iran's irregular warfare campaign will cease, but all that means is that Saudi Arabia, Turkey, and Israel will invade areas that Iran's proxies are operating out of. If the Tehran government falls we will probably see a Kurdish uprising in the north. Although it's possible that Iran's ayatollahs will die and the government could be a return to a monarchy, considering the influence of Turkey, Pakistan, and Qatar, it is far more likely to be a much more extreme jihadist faction. As with what happened in Syria and Lybia.

obsession with Jews and Israel will be left utterly fruitless

Yeah, at this rate, jews might become an internationally targeted demographic, and the US will sponsor an invasion of Israel in 40 years for being a rogue state.

Not smart.

The Golden Age could actually begin.

That's not going to happen under Islam. Especially with all the incest.