Big nations like Pakistan, Iran, and Turkey are already engaged in local conflicts. Most Arab nations do not want to become the next Libya, Iraq etc. The only reason Syria survived is due to Russia. Tragedy is that Muslim nations have been weakened/destroyed by Muslims. Now I realize why fitnah/fasaad against the state is a big no no in Islam even when you know that the leader is abusing his power.
IMO, in the short term, we should work for a ceasefire to save lives. In the long term, change world's opinion on the issue(It is happening already. This is the first time I'm seeing open pro-Palestinian stance by westerners) while building your strength/influence.
If you start a war now, it is not just Israel you will be fighting, and the capacity to fight that war is not there ... yet.
I have seen that script play out in Iraq, Libya, and Syria.