i don't think an all-out war is likely at this point.
It would be sub-optimal for Hezbollah to engage now, without knowing how much and how deep the compromise was. You don't expect a conventional war between Hezbollah or Lebanon against Israel, because they will lose big, and intelligence/counter-intelligence is primal in any irregular warfare. The Pager and Icom thing shook that aspect for Hezbollah to the core,
I personally would disengage if my organisation were compromised like that, effectively there are no comm (or trustable comm) and there are no counterintelligence aspect for Hezbollah, frankly, they don't know which phone they can use and who they can trust at this moment. The assassination and the pager thing is very clearly a one two punch from the IDF, there are NO WAY Hezbollah Comm and/or C4 structure wasn't compromised.
You need to at least wait until you can rebuild your comm network, then there are a realistic chance to fight, and that could be years.