Syria is in bad shape today. No way to send troops or weapons to Lebanon which is under international scrutiny.
Hizbollah could not go wild, they are contained in a political process which will define their whole future, though they created lately an unsolvable piece of puzzle. They claimed, besides Shebaa farms , seven villages in the Northern part of Israel that are legally and historically out of the internationnally recognized border of Lebanon. I think that this is a deceptive maneuver aimed at gaining internal support in front of the UNSCR1559. So if this maneuver comes to execution, they will have to face anihilation, nothing less.
How is Hizbollah contained by a political process? The same way that the PLO is? Hizbollah's land claims are real, and are basically identical with those of the PLO -- that Israel doesn't exist, that every bit of Israel is actually Arab territory seized by European non-Moslem non-Arab imperialists.
But I agree, Hizbollah won't stop unless it is annihilated -- and the same goes for the PLO.