I don't see the U.S. doing anything like that. I'm not even a sure the Israelis are going to launch a major ground offensive into Southern Lebanon. I'm sure the IDF is determined to go but the leadership is untried and unsure of themselves. They may be hoping the world steps in with a legitimate military force (US, French, UK, Ger, Austr, etc.) to create a buffer zone between Israel and Hezbollah.
The problem is we did that in 83' and we know how it turned out. The same thing would happen. Hezbollah would launch terror strikes against the weakest links in that force until one by one they pull out leaving the US and maybe one or two other holding the line until we amscray.
The only way to destroy Hezbollah is to cut the road from Iran to the Bekka Valley and that means pulling Syria over to us. Overthrowing the regime is not practical at this point. Syria is basically a prostitute state that sells itself to the highest bidder. First it was the Russians until the wall fell, then Iraq and now Iran. The West needs to buy them off, safe guarding their regime and giving them an aid package. In return they stop the flow of jihadists into Iraq, kick Hezbollah, etc out of Damascus and stiff Iran.
Without Syria Hezbollah will be cut off, Iran will be completely isolated and alone, and a little more stability will be brought to Iraq. It should also bring down oil prices.
I know most people would rather not make deals with a scum bag like Assad but the real enemy is Iran not Syria. Once Iran is dealth with Syria will fall without a shot being fired.
We did the same thing with Egypt in the 70s. They were joined with the Soviets until Nixon pulled them away which ultimately led to Camp David. The West has 40 trillion in wealth vs. .4 for Iran. We need to use that leverage.
I saw a Senator on FNC yesterday (I'm not sure who, I didn't recognize him, and I just caught it in passing) saying that the UN didn't need to create a buffer between the Israelis and Lebanon, that what was needed was a UN buffer between Lebanon and Syria to prevent the flow of arms to Hezbollah.
I found the whole idea quite refreshing.