Hizballah is more powerful than it used to be, true, but it would not initiate a full-scale attack on Israel unless Israel does something stupid about Iran. Hizballah's treshold to let the fire go is very high due to the fact that Israel does not refrain from killing thousands of civilians in the way to fight Hizballah, so Israel has to do something very very serious to really make them attack. If Hizballah attacks at all costs, then there is no other way than reinvading Lebanon for Israel. But this reinvasion would be infinitely bloodier for both sides, than the first Lebanon War. Plus, Israel does not have the economic strength and patience to maintain a long-term invasion. If republicans win the next election, Israel may pressure US to invade both Lebanon and Syria. Yet for this, Obama must go. Israel's long-term security is very much in jeopardy because of Likud and part of the Israeli public which supports Likud.
U.S.-led coalition conduct 23 air strikes against ISIS in Iraq and Syria (Reuters)
from the article: Why I opposed Israel's withdrawal from Lebanon