Israel fought multiple wars on multiple fronts.
This never happened.
Arab Militaries should study previous wars with Israel with great, great detail..introspect and learn...adapt..and focus on Israel, its modern fighting strategies, its possible weaknesses, and work-out detailed plans and contingencies for any possible future war.
Seeing the state of Arab militaries---this seems impossible.
Egyptian Military is paralyzed and is more interested in running its business empire, over-turning democracy, and killing and murdering its own people than to actually get enough balls to do what a professional military would do. But then again, Egyptian military is nothing but a prostitute for United States/West.
Saudi Arabian Military has some decent weapon systems..but there are severe question-marks on Saudi Military leadership and capacity of Saudi Arabia to effectively conduct and fight a brutal, intense war against an opponent like Israel and decisively defeat it...
Biggest threat to Israel is at northern front from Hezbollah.
Although, Hezbollah can't defeat Israel, it can make things really tough for Israelis and IDF in future wars...Invading Lebanon in 1982 was piece of cake for Israel---today, it would be a hard bite to swallow--specially considering Hezbollah, and International opposition to tolerate more Israeli wars in the neighborhood.