Not sure about this, everyone who could have easily stepped up has been taken out and I’m not sure the next person in charge will be around for very long given whats happened over the last few weeks.
I actually think a lot of Lebanese would like to see Iran out of it’s country, the Israelis to go away and to just be normal. I have friends who grew up in Beirut during the civil war (some have PTSD). It’s horrific and I doubt many want another one. Some will be radicalised but what do the majority want, not just the Shia?
It also depends on a) if Hezbollah is able to get itself together before another group make a grab for control, Israel is destroying it’s weapons depots atm so it’s probably drastically weakened. Also I imagine many Hezb supporters will feel disaffected by Iran not stepping in on their behalf, it may prompt a re-think on the part of many lower level members.