“Will Iran be permitted to complete its “Shi’a Crescent” or “land bridge,” stretching from Tehran through Iraq, into Syria and on into Lebanon, where Iran’s proxy Hezbollah already asserts enormous power?”
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That’s part was accomplished last week. The route through to Lebanon to the Med is open, leaving only securing the passage. To that end, Iran is now bringing in 15,000 militia under the direct command of Gen Soleimani placing those troops 10 km from the Israel border on the Golan - in well surveyed positions chosen to neutralized any Israeli oversight - they will likely have Russian air and Intel assets to interdict any Israel incursions and attempts to drive them back. (Bebe said Iranian troops along the Golan is unacceptable, but Israel seems to be ignoring the problem.)
The US seems oblivious.
I doubt that, they have attacked Iranian military bases near Damascus several times in the past month, primarily weapons caches from what I've heard. Iran may now have nukes. I'm sure if they do, Israel knows where they are. And I expect the US military does also.