It is an unpleasant prospect, but Michael Ledeen may well be correct. An excerpt:
Israel cannot destroy Hezbollah by fighting in Lebanon alone, just as we cannot provide Iraq and Afghanistan with decent security by fighting only there. The destruction of Hezbollah requires regime change in Damascus. Security in Iraq and Afghanistan requires regime change in Damascus and Tehran. Lebanon, Gaza, Iraq, and Afghanistan are not separate conflicts. They are battlefields in a regional war.