Hezbollah does not need a coup, its already taking over the country, and why? Because as much as Lebanese my despise Hezbollah they still tolerate it due to its demosntrated or perceived ability to thwart / deter Israeli agression, which they detest even more. If Israel was smart it would stop its arrogance which only plays into the hands of its enemies - you are within a short distance of having Iarn on your northern border...
Netanyahu: Most of Americans see eye to eye with Israel on dangers of Iran deal (Haaretz)
from the article: Saudis urge Lebanon PM to accept compromise with Hezbollah